A hidden gem in the middle of the city's infamous Jewelry Quarter.

The recovered bones of martyrs slaughtered during The Terror are on display in this church crypt.

In a 345-million-year-old cave that's 200 feet underground, dinner awaits.

A science fiction-inspired apartment building designed by a famous Spanish architect.

Breathtaking Byzantine paintings cover the inside of this 12th-century church.

Outstanding, eerie frescoes and decorations fill this 19th-century monastery.

Salt is slowly eating away this abandoned saltworks town in the desert.

Italy's "New Mountain" rose from the ground in a volcanic eruption in 1538.

A tree that defies gravity grows in an ancient ruin.

Built in the 1300s, this magnificent building that hosted England's kings and queens transports you to the Middle Ages.

A former 16th-century monastery houses a museum dedicated to the island and its culture.

Modernist design and funerary customs meet Spartan traditions in this one-of-a-kind graveyard.

This serene, turquoise lake in an extraordinary nature reserve showcases a rare natural phenomenon.

The tragic heiress Barbara Woolworth Hutton built her seventh husband this Japanese-inspired palace in Mexico.

Architect Le Corbusier built his friend a cubist house to match his impressive collection of cubist art.

Site of one of World War I's most horrific scenes.

Founded in 1880, this humble brewery still practices a disappearing technique of sake-making.

Through the colossal entrance to this cave you'll find limestone tubs and an underground waterfall.

A rare festival blending religion, blacksmiths, vagina dentata, sex workers, and the straight-up facts of life.

The verdant mossy ruins of a Franciscan monastery lie in the remote Sintra hills awaiting exploration.

The ruins of an ancient stadium that hosted gripping chariot and horse races.

Ecuador's largest Incan ruins show evidence of sophisticated irrigation and diplomacy among the ancient builders.

This unique bridge curls up like a caterpillar to let boats pass and then unfurls again to span a small canal.

This famed marionette theater and museum is bursting with imaginative string puppets.