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

These spectacular ruins were built by Spanish padres in the 17th century.

Of the many Jesuit missions in South America, this complex is one of the best preserved.

A series of waterfalls so massive they straddle the border of Argentina and Brazil.

Parts of this former military training ground may have inspired parts of J.R.R. Tolkien's famous fantasy series.

A giant gleaming memorial named for a coal miner who gave his life to the pits.

The house where Charles Darwin's grandfather formed many of his influential ideas and inventions.

These medieval carvings bear scars left by Parliamentarian troops during the English Civil War.

The little-known second castle that William the Conqueror built in York.

Semaphore saints, a golden dragon's head, and a stone carved with religious warnings all call this cathedral home.

This memorial to World War II's fallen airmen shows us the movements of the stars that once guided them.

This sculpture marks the spot where one of the greatest Roman rulers was proclaimed emperor.

The commemorative stone column conceals a secret laboratory.

An architectural oddity hides in plain sight on this iconic London bridge.

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

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

Constructed along the shores of Lake Zurich, this pavilion is a walk-through work of art.

One of a series of no-purpose kinetic artworks by Swiss sculptor Jean Tinguely.

One hundred years ago this small house in downtown Zürich became the birthplace of the Dada movement.

This charming fountain honors Felix Salten, the creator of the iconic storybook deer.

Vines grow up the metal bars in this public park created from an old machine factory.

The oldest operating roller coaster of its kind, the Montaña Suiza has been thrilling riders since 1928.

Giant topiary dog once played a role in a terrorist bomb plot.