An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

Deadly scalding and one of the largest hot springs in the world.

One of the most iconic neon ads of former East Germany.

The last bastion of Roman presence north of the Alps looms over a German town.

The birthplace of Karl Marx is now a museum dedicated to the communist revolutionary's life and work.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

Tubing through a cave lit with glowworms is a magical underground experience.

Major tourist destination known for its bubbling mud-pools and hot thermal springs.

The real life Hobbiton, this sheep farm has been forever transformed since being built for The Hobbit film series.

One of the world's largest Tesla coils.

New Zealand's west coast is one of the best places in the world to view these large seabirds.

The platform atop this verdant volcano was built with the help of a royal elephant.

A New Zealand communications tower stands as the tallest structure in the Southern Hemisphere.

This quiet island in the middle of a bustling city is actually a volcano dotted with Māori ruins.

A network of fortifications that never saw conflict.

To the great disappointment of doomsdayers, this codex merely contains records of the Moon and Venus.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

This unique medieval artwork featuring the story of the Antichrist remained lost for decades.

What was once an underground Nazi city is now Europe's largest bat reserve.

The site of one of the largest prison escapes of World War II.

A collection of biblical memorabilia.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

Giant wind turbine with observation deck at the very top.

The tunnel's elegant proportions keep you snug with no claustrophobia freak-out.