The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.

This stunning mass of ice spans 121 square miles and is still growing.

This bridge over the River Cuale leads to a neighborhood that was once an escape for Hollywood's elite.

This neon blue river gets its color from a unique mix of bacteria and volcano minerals.

Central America's deepest lake is actually a volcanic caldera, surrounded by three volcanoes.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

Famously misunderstood wonder of the ancient world

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

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

It houses the remains of a 17th-century version of the Titanic.

The world's largest moose statue towers above the highway between Oslo and Trondheim.

This isolated structure beckons adventurers with sublime views of the Faroe Islands.

An Iron Age fort on the edge of a seaside cliff offers a glimpse into an ancient, mystical world.

Medicinal spa created with the discharge from a geothermal energy plant.

Greenland's first shopping mall also hosts the country's government.

Copenhagen's celebrated theme park and gardens.