Wander through the Corridor of Wonders in these stunning limestone caverns.

Swedish skyscraper with a 90° twist.

This chimerical bridge/tunnel appears to dead end right into the sea.

An image of the legendary saint stands in the shadow of a cathedral she liberated.

The effect of this ancient form of image projection situated atop an 11th century Moorish palace is thrilling.

One of Antoni Gaudí’s earliest buildings, built between 1886 and 1890 for the industrialist Eusebi Güell.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

A display of torture devices used in the Spanish Inquisition and other scourges of medieval Europe.

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

Of the many chalices in the running for the Holy Grail, this one in Valencia Cathedral sure looks the part.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

The final resting place of the great navigator, or maybe his brother.

The world's largest wooden structure.

The hallucinogenic center of the ancient world.

The headquarters of the Mahanikai school of Buddhism, Thailand's largest monastic order.

The largest madrasa in Morocco once housed more than 900 students within its exquisite walls.

Fortune tellers, snake charmers, poets, and storytellers all gather on this historic square in Morocco.

With a history of slaughter, feast, and famine, remnants of the pork industry decorate this area--even its church.

The remaining relics of the patroness of Paris lie in a chapel under a striking double spiral staircase.

An unusual number plate signifies the building's saucy past.

This bridge was constructed from the rubble of the infamous Bastille.

A series of abstract, silly sculptures represent the works of a great modern classical composer.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.