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

These azure waters were thought to lead to the Mayan Underworld.

In the middle of one of South America's most historic walled cities lies a bar with an enormous collection of Soviet memorabilia.

An inspired museum dedicated to the patron saint of enslaved people, inside the cloisters where he lived and died.

The caldera of this mini-volcano has been turned into a naturally heated mud bath.

This dizzying span over the ancient Algerian city was once the highest suspension bridge in the world.

This massive monument towers over the city as a constant reminder of the lives lost during Algeria's hard-won war for independence.

An extraordinary mix of Phoenician, Roman, early Christian, and Byzantine ruins beautifully set overlooking the Mediterranean.

The original resting place of Queen Cleopatra and Mark Antony's only daughter.

Founded in 670, this ancient mosque is an architectural time portal.

The ancient heart of Tunis is an enormous maze of narrow streets and alleyways.

An ancient burial ground believed to have been used for ritual sacrifice.

The best-preserved Roman small town in North Africa.

The largest and best-preserved Roman amphitheater in Africa was designed to seat 35,000 people.

The world's highest and most dangerous infinity pool lies at the precipice of Victoria Falls.

There is only one place in the world where the corners of four nations come together.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

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

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

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

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

The prototype for all Nazi concentration camps.

The footprint of a frustrated devil in Munich's Cathedral.