This beautiful natural train tunnel is said to grant the wishes of visiting lovebirds.

An Australian lake whose pink hue defies scientific explanation.

This magical grotto is adorned with a complex pattern of native seashells, minerals, and fragments of colored glass.

A bizarre house filled with an astounding array of collections.

The kitsch mansion of the former Romanian president Nicolae Ceaușescu features a golden bathroom.

Try the frozen treat that inspired Arrested Development's famous banana stand.

The palace of the King of Kings, burned by Alexander the Great.

This ancient fortress in Iran was once the oldest and largest treasury in the world.

This cliff-face port is considered a masterpiece of mining engineering.

A strange rock with a sinister reputation lurks within the crimson waters of this Scottish glen.

In a largely deserted ghost town, a little brick building recalls its history as a gold rush hub and haven for outlaws.

The world’s tallest outdoor lift stretches along the stone pillars that inspired the floating mountains in the movie “Avatar.”

If you don't look closely, you might mistake this sculpture for just another passenger waiting at the airport.

Hundreds of Buddhas in a re-discovered Indonesian temple.

The dramatic upward-curving roof is one of the most iconic examples of Googie architecture that still stands today.

The watery grave of Captain Bligh's famous ship.

This was once the center of the Birdman cult, and is now a World Heritage Site.

A volcanic crater that visitors can look inside.

The ominously named cave is home to some remarkable ancient art.

The world's most remote airport.

The largest stone moai on Rapa Nui.

In the Middle Ages, villagers would sound this stone trumpet to boost fertility and coax fish to shore.

This Peruvian bone silo lined with hanging human skeletons and hundreds of skulls is topped with a remarkable Michelangelo replica.

A paradisical gorge with rapids, waterfalls, and wildlife whose raw beauty is the stuff of CGI movies.