A gateway to a mysterious network of underground tunnels.

Massive rock sculptures formed during the time of the dinosaurs still stand undisturbed.

A bright little alley in La Boca is a part of tango history.

105-foot wide giant metallic flower blooms anew every day in the heart of Buenos Aires.

This historic, palatial theater is now one of the world’s most beautiful bookstores.

The design of the Palacio Salvo has been described as "a lighthouse on top of a building."

A crumbling cathedral condemned by an earthquake.

Over 4,700 miles of trees being planted to hold back the desert.

An island made out of shells, including a cemetery.

West Africa's largest fishing port honors its artisanal fishing process.

This deceptively salty lake looks like blushing pink lemonade.

This giant statue is the product of a mixture of corruption, Stalinist architecture, and North Korean manpower.

Despite a fraught and controversial history this African island holds a powerful monument to the tragedy of the slave trade.

This abandoned bunker looks out over the Atlantic from its clifftop perch.

An ornate plague column – built to celebrate life – claimed the lives of numerous artisans during its construction.

Macabre astrological automaton clock dating to the late 1400s.

The Voodoo Superstore of the world.

Africa's Venice on stilts.

This micro-nation may be some sort of prank, but its constitution sure seems official.

An old hill fort covered in over 100,000 crosses is a symbol of Lithuanian nationalism and beliefs.

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

Sweden's "good old days" painstakingly re-created in a model village.

This bazaar is one of the oldest in the Arabian world.

A preposterously luxurious hotel with gold-plated iPads, Rolls Royce chauffeurs, and a staff that trains by watching "Downton Abbey."