A marble Lucifer hides behind the pulpit of this Gothic cathedral.

Dress up like a miner and take a slide into the disco-lit depths of this once foundational salt mine.

See massive fossils that are over 200 million years old in northeastern Arizona.

A spiritual vortex among the red rocks in Sedona.

A small man-controlled waterfall powers an Art Nouveau elevator and is accessed via narrow gauge, solar-powered tramway.

An enormous and lavish Gothic church in Czechia.

Disused seaplane hangar gets a second life as the jaw-dropping home of Estonia's museum of maritime history.

A former imperial sea-fortress and Soviet prison.

An empty relic of the Moscow Olympics crumbles away in Estonia's capital.

World's only telecommunication tower with a wooden pinnacle.

World's largest barrel containing an inn.

This incredible stone temple is a monument to death, victory, and fantasy architecture.

This small exhibition displays equipment and artifacts once belonging to the feared Stasi secret police.

Amöneburg is a town perched on top of a basalt mountain in the middle of an ancient meteor crater.

A sprawling Baroque park with 300-year-old hydro-pneumatic waterworks.

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

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A reproduction of earth's many biomes.

A beautiful geyser under environmental threat.

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

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

Macabre astrological automaton clock dating to the late 1400s.

A church of bones, decorated with 40,000 human skeletons.