A tunnel with windows, so you don't miss out on the impressive views.

The unusual patterns in this rock formation result from two distinct modes of weathering.

This ancient cave is home to a museum, bar, and is filled with fluorescent minerals.

The largest natural travertine bridge in the world is nestled in a small canyon in central Arizona.

A massive volcanic plug is now a protected area that hosts a number of bird species.

Monument to a suicide protesting the Soviet invasion.

A mocking tribute to the past and modern leadership of Prague.

What looks like a suicide in progress is actually a statue of Sigmund Freud.

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

Macabre astrological automaton clock dating to the late 1400s.

Late at night, the bust of the "Dracula" actor was snuck onto the facade of this Budapest castle.

A fake Transylvanian castle houses a cathedral of antlers.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

Come for the pizza, stay for a performance on the world's largest theater pipe organ.

Every year, festive decorations appear on this juniper tree located in the median strip of a busy highway.

This ancient trail has claimed the lives of over 2,000 people.

The unusual burial monument of Arizona's first governor.

Open since 1938, this diner has kept its fountain, malt machine, and all the gum that greasers left beneath its counter.

A self-built castle made by a mysterious man.

This striking public art installation is suspended above a public park, designed to gently move in the breeze.

This public square capitalized on a single Eagles reference to bring some life back to an Arizona town.

Once the product of an inexplicable gold strike, this ghost town is now home to one man and his love of classic machines.

Hidden inside this Arizona fast food franchise is an in-depth exhibit on the famed WWII counterintelligence program.