Large World War II gun emplacements and tunnel systems remain hidden near a remote end of Waiheke Island.

Prehistoric history as seen through the lens of an outsider artist.

This imposing memorial contains the remains of Che Guevara — and 29 other guerrillas who died with him in Bolivia.

Mysterious Incan ruins on a tiny island in Lake Titicaca.

The ruins of a 2,000-year-old Roman fishing village perched on one of the best beaches in Spain.

Crafted from ocean litter, this sculpture highlights the ills of overconsumption.

Neo-cave art on the macro scale.

Besides being home to cave paintings and pre-Columbian Cuban archaeological remains, you get to take a boat through this stalactite and stalagmite covered cave.

These tenacious 14th-century towers defied demolition and are now a fairytale vacation rental.

Take a walk in a recreation of ancient Rome.

Oldest Museum of the Netherlands is a true cabinet of curiosities.

Men in rubber-soled boots serve as your "brakes" on this toboggan ride Hemingway described as "exhilarating."

This local emblem is the oldest and largest dragon tree in the Canary Islands.

Nature puts on a spectacular show at this blowhole on the eastern side of Gran Canaria.

A solitary tree has grown up all alone on Lake Wānaka, backdropped by the beautiful Southern Alps.

A lakeside garden in the Southern Alps full of whimsical artwork and thousands of beautiful flowers.

The most southerly spot on New Zealand's South Island is home to surreally shaped, permanently mangled trees.

The last remnant of Kuala Lumpur’s old prison complex now stands on the edge of a Japanese shopping mall.

This museum explores iconic buildings and the cultural heritage of Malaysia in miniature form.

A lonely memorial to the 107 victims of Pan Am Flight 812, which crashed in Bali in 1974.

A haunting theme park is slowly being swallowed by the jungle.

This massive complex is made up of hundreds of smaller temples that date back to the ninth century.

Of five volcanoes located in the massive Tengger caldera, this cone is the youngest and most active.

The inky volcanic sand leads to reefs teeming with aquatic life waiting to be discovered by snorkelers and divers.