Learn about the history and craftsmanship of carousels inside this museum located in a former post office.

This iron and wood Civil War city-ship was the first vessel to be sunk by an electrically detonated torpedo.

Park filled with machinery that drove the southern agriculture and oil industries forward.

World's smallest skyscraper, the product of a remarkable con.

This volcano rises like a giant anthill from the plains below, with a road spiraling up to the rim.

A futuristic hovertrain is parked unceremoniously alongside a nondescript road.

This ancient octopus-like tree was saved from destruction thanks to shady reporting.

A fascinating aviation museum where you can chat with the veterans who once flew the aircraft on display.

One-of-a-kind museum inside the first Boeing 747-400 ever made.

The world's largest collection of fine-scale miniatures and one the nation's largest collections of antique toys.

Once decrepit and slated for demolition, now one of the longest pedestrian bridges in the world.

This replica of the Greek structure is in the heart of Nashville.

A unique attraction and museum dedicated to exploring iconic roadside structures.

Air Force Academy Chapel made of 100 identical tetrahedrons works to inspire those of all religions.

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

This grand stone tower was dedicated to a famed American humorist almost by coincidence.

When zealous marijuana enthusiasts kept stealing the "Mile 420" highway marker, the State of Colorado got creative.

The largest self-built castle in the U.S., six decades in the making.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

The only runway directly into the magic kingdom has been closed since 1972, but it still sings to you if you drive fast enough.

As its grandiose name implies, this wooden dome is unsurpassed in size.

An angular maze of concrete in Grand Rapids acts both as public art and as a staircase for fish traveling upstream.

One lonely, modern pyramid has gone from corporate think tank to deserted boondoggle.