Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Hear the quietest sound from across the dome.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

Go inside to really appreciate this 500-year-old technological masterpiece.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

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

A little sculpture with a large wardrobe.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Famously misunderstood wonder of the ancient world

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Eighty million natural history specimens call this gargantuan museum home.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

This decoration above a door, an unofficial family crest, is said to come alive during the night to try to get free of the stone.

An anti-tank graveyard in the English countryside.

It's said that at this location, a Scottish poet met the Queen of the Fairies.

Legend says this sacred tree was a gift from goddess Athena.

An ice field known for harboring an infamous Martian meteorite turned out to contain the oldest air on Earth.

The 19th-century home of Count and Countess von Hallwyl is now a museum.

These cascading falls resonate throughout the Bulgarian forest.

One of the biggest Buddhist stupas in Europe, hidden from most locals.

At 22 feet tall, these Bronze Age monoliths are some of the tallest standing stones in the United Kingdom.

A long-abandoned relic of World War II.