The construction of a tram line unveiled hidden remnants of the old medieval city.

This massive blockhead sculpture hides an entire library.

There is a strange little carving of a person seemingly crushed by a pillar behind the remains of St. Thomas Aquinas.

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

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

A rare set of strings by famed instrument maker Antonio Stradivarius is on display in the Royal Palace.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Every equinox this Maya pyramid puts on a spooky ancient light show.

A circus of light and sound forms a sensory ode to an iconic train that will never pass through town again.

This striking art museum holds an amazing series of curiosity cabinets.

Statue dedicated to the star of an old television show.

A place to eat for on-the-run agents and espionage enthusiasts.

When you visit his grave, be sure to rub the Great Emancipator's nose for good luck.

Catacombs turned marketplace.

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

This one has sailed five times as far as Sir Francis Drake's famous ship.

An incarceration museum on the spot of possibly the oldest prison in England.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

A hands-off space for graffiti artists to hone and display their skills.

Giant, friendly pelicans in Central London, the most unlikely of places.

This funicular railway rumbles along for a mile up the nearly vertical face of Chattanooga’s Lookout Mountain.