One of the world's last well-maintained airship hangars.

This Brazilian Lady Liberty is one of the few replicas that was actually made by the original designer.

Peanut butter trees and miracle berries are just the beginning.

A massive bridge forms part of an aqueduct that was deemed an architectural wonder of its time.

A limestone grotto where daylight filters in from below and turns the water a beautiful turquoise. Also home to a small underwater nativity scene.

Known as the "Valley of the Moon," this Jordanian wadi is one of the most amazing desertscapes on Earth.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

Where the sleeping monsters of Scotland's oil industry are left to rust.

This waterfall is one of the most spectacular natural features in the Scottish Lowlands.

The sinister ruins of one of the worst dam failures of the 20th century lie in this astonishing alpine setting.

A climbing route in the mountains of Italy’s Dolomites, built for soldiers during World War I.

This centuries-old Italian chapel hangs midway down a sheer cliffside.

This former steel and coal plant is now a neon-lit industrial fantasia.

The world's biggest pet store.

No need to strap in for a "ride" on this walkable roller coaster.

A statue of the second-tallest Dutchman in history.

Tucked away in the Leiden city hall are a group of works by famed artist MC Escher.

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

A subterranean playground in an abandoned slate mine.

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.

The world's first underground farm is in a World War II bomb shelter beneath the streets of London.

Several plaster noses are hidden in plain sight around London's Soho neighborhood.

A student driver's nightmare.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.