Rare karst landscape eroded from a flat seabed.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

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

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

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

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

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

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

A unique geological area spiked with wind-carved rocks that resemble teepees.

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

A collection of huge Pre-Colombian structures in Alabama.

This "Plant Farm Museum" is home to the divinely inspired and visionary outsider artwork of Reverend Howard Finster.

These ancient ritual mounds are our best window into the culture of the ancient Mississippians.

This steep cable railway has been hoisting passengers in the heart of Québec City for over a century.

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.

Climb to the top of the world's largest seated bronze Buddha.

Count the statues to gain insight into your future from Buddhist disciples.

One of the word's deepest gorges is also tied to a fantastic legend.

This bar is home to what's likely the oldest living jazz band in the world.

The once highest point in China blends symbolic design with a kick of adrenaline.

The tiny statues form China's only known terracotta army from the Han dynasty.

Enormous burial mounds of ancient emperors.