This charmingly homemade amusement park has been growing for 40 years.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

A geological mystery on Camelback Mountain.

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

An urban laboratory.

A spiritual vortex among the red rocks in Sedona.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

Ancient pueblos built into the base of a natural canyon wall.

A large circus museum with summer performances.

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

A towering work of stone and philosophy that was constructed using ancient Hindu science.

The remains of what was, not so long ago, the world's largest city.

At 8,000 feet, the world's highest tea estate draws visitors for both its products and its panoramic views.

World's tallest monolithic statue has served as a pilgrimage site since its completion in 993 CE.

Modest by day, illuminated majestically at sunset.

You might know it as the Overlook Hotel, but the inside is not going to be familiar.

The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

An emporium for the weird, creepy, rare, and just plain gross.

Featuring a casually threatening atmosphere along with dessert and coffee to die for.

A beautiful 62-acre Catholic shrine and botanical garden.

This striking art museum holds an amazing series of curiosity cabinets.

"World's largest scrap metal sculpture" stands in an outdoor sculpture garden in the middle of Wisconsin.

A tribute to the twin ideals of religion and patriotism, built by a Catholic priest from rocks, glass, and innumerable found items.