A saintly relic hidden in a Prague church basement.

Two stunning 17th-century libraries and a cabinet of curiosities.

Macabre astrological automaton clock dating to the late 1400s.

Eighty million natural history specimens call this gargantuan museum home.

Catacombs turned marketplace.

One of the largest mechanical models of the solar system in the world.

The gloomy ruins that inspired Bram Stoker to bring Dracula to life.

These 20-foot jaw bones honor a time when the leviathan bones were a sign that whalers survived the hunt.

England's "pier at the end of the universe" unites astronomy and contemporary architecture.

Built in 1911, the Tees Transporter Bridge is one of only six transporter bridges still in operation.

The legend of a monkey that was hanged as a spy has inspired not only a football team name, but a successful mayoral campaign.

This iconic 1,000-year-old medieval castle is a favorite of the film industry, most notably as the location for Hogwarts in Harry Potter.

The sign at the garden gate reads: “These Plants Can Kill.”

Derelict chemical plant on the North Sea is a beautiful industrial ruin.

This enchanting Victorian estate was home to the world's first hydroelectric power generator.

Huge winged monument in the United Kingdom.

This century-old grotesque has a mysterious history and may not actually be a rabbit.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

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

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

An elaborate gift from Claus Spreckels is now a piece of San Francisco history.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

A mysterious painting of the self-declared Emperor of the United States watches over a local hof-brau.

These subterranean storage areas hold emergency water reserves.