The site of an ancient Mississippian settlement that appears to have flourished during the 10th to 13th centuries.

The remains of one of Wales’ great medieval buildings, with a pub in the cellar.

The castle still holds traces of the abandoned Roman fort it was built atop.

Picturesque ruins once held off mighty armies.

A harem-inspired Moorish fantasy design in a Victorian-era Welsh castle.

This well-preserved Cistercian Abbey in a romantic pastoral setting has inspired artists like the poet Wordsworth.

For over two centuries, this palace served as a residence for the Holy Roman Inquisition's leaders, a courthouse, and a prison.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

The land is home to swimming ponies and a legendary 18th-century treasure.

The Cape of Good Hope is not quite as low as you can go on the African continent, but it's still geographically significant.

A vertical tube that allows you to see what's going on underneath the Antarctic sea ice.

This uniquely shaped slab of volcanic rock has been used by generations of Antarctic explorers.

This charming stone church on the shore of Lake Tekapo is an icon in astrophotography.

The life of one of FDR's possible mistresses is preserved in her palatial Hudson Valley mansion.

Quite possibly the most isolated bus stop on Earth.

On a desolate hill overlooking McMurdo Station, a statue of the Virgin Mary stands inside a curved iron frame.

Also known as the Great Mosque of Damascus, this is one of the world's largest and oldest mosques.

This war hero's old shop remembers the fine line between medicine and quackery during the Revolutionary War.

This iconic Peak District ridge was once one of the busiest roads in medieval Britain.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

Narrow slot canyons in a badland eroded into soft sedimentary rock provide an otherworldly landscape in this remote Nevada state park.

Home to the deepest rift anywhere on Earth.

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.