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Giant objects, odd monuments and things built for no clear reason.
Hereford, AZ
A large undeveloped limestone cavern inside Coronado National Memorial can be reached by a steep trail and explored without built lighting. Visitors need appropriate lights and should follow NPS cave guidance rather than treating it like a commercial show cave.
Lindsborg, KS
A WPA-era stone 'castle' crowns a hill traditionally associated with the route of Francisco Vásquez de Coronado's expedition. The historical connection is interpretive rather than a preserved expedition structure, but the isolated stone lookout is a distinctive roadside landmark.
Paradise Valley, AZ
Architect Paolo Soleri's experimental complex uses earth-cast concrete, apses and unusual passive-solar forms that feel more like an archaeological site from the future than a conventional workshop. Artisans still cast Soleri bells on site.
Berryville, AR
Cosmic Cavern is a privately operated show cave known for underground lakes and elaborate formations. The cave stays unusually warm for the Ozarks and has been open to visitors for decades.
Rapid City, SD
The Mystery House is deliberately built and staged so visitors appear to stand at impossible angles while balls seem to roll uphill. It is a classic American gravity-hill-style attraction where perspective and construction create the illusion that normal physics has stopped working.
Sweden Township, PA
Billy O'Neil discovered this strange cavity in 1894 while prospecting, and it became famous because ice forms inside as outside temperatures rise and retreats again as the weather cools. After decades as a roadside attraction and a long closure beginning in 1990, new owners restored and reopened it in 2014; visitation remains seasonal.
Bridgeport, NE
These massive Brule clay and sandstone formations were major landmarks for emigrants on the Oregon, California and Mormon trails. Their castle-like shapes inspired names such as Court House, Jail House and Solitary Tower. Public access allows travelers to see the same skyline repeatedly described in nineteenth-century journals.
Tulsa, OK
Installed in 2025, Cowboy Bob is a 21-foot guitar-playing Muffler Man designed as a honky-tonk cowboy. He stands across Route 66 from Tulsa's other modern giants, making the block an unusually dense roadside-statue cluster.
Lenox, AL
A sixty-seven foot fibreglass horseshoe crab, hollow enough to stand inside, built in the 1990s for a maritime attraction in Baltimore's Inner Harbor that closed before it opened. It has moved four times since: to a creationist museum in Kentucky, then a church car park in Blanchester, Ohio, then a private lawn near Hillsboro, and since roughly 2021 to a private attraction north of Lenox in Conecuh County, Alabama. Our coordinates are approximate — placed from directions rather than a survey — and the site is private, so check before turning up.
Christmas Valley, OR
A long volcanic fissure splits the high desert, allowing hikers to walk between steep rock walls; BLM warns that access roads are rugged and four-wheel drive is strongly recommended.
Providence, RI
Completed in 1907, the massive Cranston Street Armory resembles a medieval fortress planted in a Providence neighborhood, with twin towers and an enormous drill hall. Its scale and castle-like exterior have made it a favorite landmark even when the interior is not open. Unless an official event or tour is scheduled, treat this as an exterior viewing stop. Secondary source: https://www.atlasobscura.com/places/cranston-street-armory
Murfreesboro, AR
Visitors can search a plowed volcanic field for real diamonds and keep what they find. It is one of the only public diamond-bearing sites in the world where found stones belong to the visitor.
Arco, ID
Primary public orientation point for Craters of the Moon's lava fields, cones and caves. Stop here for current road, trail and cave information before entering the monument loop.
Chippewa Falls, WI
Chippewa Falls helped launch the era of supercomputing through Seymour Cray's work. The museum preserves a Cray-1 and other computing hardware whose curved cabinets and dense wiring look almost sculptural beside today's tiny electronics.
Crazy Horse, SD
An enormous mountain carving of Crazy Horse has been under construction in the Black Hills since 1948. The unfinished sculpture, museums and ongoing work make the site as much a record of a decades-long monumental project as a finished attraction.
Effingham, IL
A 198-foot white cross rises beside Interstates 57 and 70, visible for miles and surrounded by smaller religious monuments.
Oneida, NY
Built in 1989 on a tiny platform in the middle of Mason's Pond, Cross Island Chapel measures only about 28 square feet and has been promoted as the world's smallest church. The chapel is reached by boat for private ceremonies, but ordinary travelers should view it from the public roadside rather than attempting to cross the pond.
Groom, TX
A 190-foot white cross rising over the plains beside I-40, surrounded by bronze Stations of the Cross and other religious sculptures.
Croswell, MI
Built in 1905, this narrow pedestrian suspension bridge sways above the Black River and carries the famously odd instruction "Be Good to Your Mother-in-Law." The bridge remains a free public landmark and gives travelers a quick, slightly unnerving walk across the river.
Crowley Lake, CA
Thousands of naturally formed stone columns line portions of the reservoir shore, exposed by erosion and best reached only with suitable road and lake conditions.
Spring Valley, WI
Stairs descend into passages lined with stalactites, flowstone and other limestone formations at Wisconsin's longest known cave. Guided tours run seasonally, and the temperature underground stays around fifty degrees whatever the weather above.
Richmond Township, PA
Crystal Cave was discovered in 1871 and became one of Pennsylvania's earliest commercial show caves. Seasonal guided tours descend into passages filled with stalactites, stalagmites and crystalline formations, with additional exhibits and attractions above ground.
Put-in-Bay, OH
Stairs descend beneath a working winery on South Bass Island into a small chamber lined with celestite crystals, some of them among the largest ever found. It was discovered in 1897 by men digging a well, and the tour takes in both the cave and the winery above it.
Boonsboro, MD
Discovered during quarry work in 1920, Crystal Grottoes developed into Maryland's only commercial show cave. Guided tours descend into chambers filled with stalactites, flowstone and other formations, so visitors must enter during the attraction's operating season and tour hours.
