An ancient iron pillar in Delhi that seems to be rustproof.

The mysterious empty cupola behind the monumental arch points to an ancient prophecy of Delhi.

A blooming house of worship for the masses.

This monument depicts a harrowing event involving an escaped polar bear.

Dedicated to one of the nation's worst engineering disasters.

A trio of giant megalithic stones in the middle of a golf course.

A cottage built at the birthplace of Alexander Selkirk, a sailor who inspired the novel 'Robinson Crusoe.'

This vintage gem is one of the oldest surviving purpose-built movie palaces in Scotland.

This museum is home to one of the biggest collections of printing press technology—plus a river view.

A hidden three-foot-wide house separates these two regal churches.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

This bakery and museum offers tours of the tastes and mythology of Aachen's signature spice biscuit—just don't ask for the recipe.

The body of at least one victim of a construction accident was left behind in the collapsed pylon, buried under tons of concrete.

The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.

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

This futuristic German television spire is actually the world's largest digital clock.

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

A replica of the Roman emperor in glorious full color.

A unique art installation located on what was once considered the widest railway bridge in the world.

This colorful mosaic remembers one of Britain's most deadly peacetime fires.

The 18th-century inspiration behind Harry Potter's Sorting Hat.

The site of the first international football match.

This giant sculpture made of trash is a critique of society's wastefulness.

Ancient catacombs form the foundation for this Rococo orgy of a church.