According to the Guanches, the aboriginal people of the Canary Islands, the king of evil lives inside this volcano.

Climb inside an iron crystal magnified 165 billion times its normal size.

A little sculpture with a large wardrobe.

The fairy tale castle of the "fairy-tale king."

The most loyal of little dogs, or a Victorian era publicity stunt?

Protecting the dead from opportunistic body snatchers.

Climb to the top of the world's largest seated bronze Buddha.

It houses the remains of a 17th-century version of the Titanic.

Sweden's "good old days" painstakingly re-created in a model village.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

Vortex-shaped aquarium hosts Europe's largest school of piranhas and other ocean creatures.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

A marvel of Byzantine engineering under the streets of Istanbul.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

Where commuters walk through remnants of an ancient Greek necropolis.

The celebrated eyesore created by starry-eyed sweethearts.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

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

A rare water-powered funicular, it uses a huge tank of water and gravity to do its work.

The 80-foot tire that looms over Michigan's I-94 was once a Ferris wheel in the New York World Fair.

Niagara Falls holds a special place in Nikola Tesla's history, so they put a statue on it.

One of the largest underground systems runs under Canada's largest urban center.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

Model Trains and Much More in Hamburg.