If it feels like a speakeasy, that’s because it probably was one.

When ecosystems collide in the arid Southwest.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

For just a few hours each morning, this market serves specialties from the city's shrinking Chinese-Indian community.

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

Spain's largest bullring offers a unique glimpse at architecture and history.

The facade of this 16th-century building is decorated with carvings of 300 seashells.

The site of a legendary battle immortalized in medieval literature.

This magnificent castle grew from a small Moorish fortress, and reportedly inspired two iconic Disney castles.

The Roman city was the birthplace of various emperors and is home to one of the empire's most impressive architectural feats.

A complimentary beverage is offered to the bodega's resident rodents every day.

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

An eerie collection of the surviving structures from a past celebration of the future.

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

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

A 16th-century Andalusian palace.

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

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

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.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

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

The highest paved road in North America winds its way up Mount Blue Sky in Colorado to an altitude of 14,130 feet above sea level.

This tea house was a hand-built gift from Boulder's sister city in Tajikstan.