An archaeological museum at the Aztec pyramid displays signs of the New Fire ritual performed every 52 years.

The cave holds a spectacular array of stalactites and stalagmites, including one shaped like a giant human heart.

From a distance, Latin America's first Baha'i Temple looks like an enormous egg perched atop a hill.

A mysterious architectural gem in one of the most elegant areas of Buenos Aires.

The extensive relics of an ancient Roman and Phoenician fish processing plant hide in a town park.

This enormous secondhand bookstore inside a Victorian train station sparked the "Keep Calm and Carry On" craze.

The abandoned palace stands as a wounded but proud beacon of Afghan hope.

The remains of a Rockefeller's lush Italianate estate hidden in the underbrush on the coast of Lake Michigan.

The NBA player's elaborate former home is now a ghost of its old glory.

Iceland's tribute to its thankless civil servants.

This network of narrow, medieval passages has the most delightful name.

Built by the Ancient Greeks, this chariot bridge is still in use today.

In the ruins of Glastonbury Abbey lies the alleged resting place of the legendary king.

Charles Dickens described the concert room in this amazing Victorian hall as "the most perfect room in the world."

The picturesque southern city served as the zombie-filled town of Woodbury in 'The Walking Dead.'

The bright red cars take travelers through breathtaking Tuscan scenery.

A spectacular disused railway viaduct in a beautiful countryside nature reserve.

The ruins of an ancient Roman tomb hidden in the basement of a trendy clothing store.

A 13th-century inn where the ill-fated King Charles I spent his last night of freedom.

A crushed gate and giant bronze head serve as a reminder of Greece's fight for freedom.

Rich with fauna and flora, nature-lovers can walk across the sea at this UNESCO World Heritage spot.

This 1920s Dutch barge is now a floating bookstore.

An enigmatic sculpture depicts a ruined home with debris stretching for over half a mile along the river.

This natural sea arch highlights Ireland's rugged coastal beauty.