Once in disrepair, this popular Texas stop along iconic Route 66 has been restored to its past glory.

The high point on the 16th president's eponymous roadway is marked by a massive version of his head.

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

The Grand Canyon of Texas.

The 10th-tallest pyramid in the world, this former sports arena is now home to a massive Bass Pro Shops store.

Dedicated to a synagogue that was destroyed after having survived World War II.

This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

A mechanical clock built in 1914, with a rotation of 12 historical figures on its face.

When a medieval fire claimed the original St. Stephen’s Cathedral, it sparked a pattern of unquenchable organ building.

From Nazi chemicals to the CIA, this architectural marvel has played a fascinating role in German history.

A modernist landscape of water and sci-fi concrete.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

The state bird of New Mexico, constructed entirely out of garbage.

The set location for a 1987 cult classic draws international film buffs to the middle of the Mojave Desert.

This dormant volcanic crater has been converted from a roiling pit of magma to a pleasant hiking spot.

The ghost town that ended up on Ebay.

A pair of large white marble lions guard this stretch of the Mojave Desert, and it is utterly mysterious how they got there.

This golf ball–shaped former desert real estate office now houses a UFO museum.

This immigrant bridge once spanned the Thames but is now a fixture of an Arizona city.

An abandoned 1920s-era stretch of cabins now overshadowed by the 66 Motel.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

Dakota legend claims this locally iconic pinnacle was once part of a sacred burial site that was cleaved in two.

Giant six-pack could provide one person a six-pack a day for 3,351 years.