No one knows who built this strange cave of worship or exactly why.

A magically clear, blue river that seems to spring from nowhere.

This magnificent Cincinnati graveyard is also a popular public park.

This ornate English estates "Prodigy House" still bears the cannonball marks of civil war.

This fantastical waterfall is hidden in a cave located in a cracked cliff.

A cave dwelling that was started by the Celts, expanded by monks, and finished by knights.

These tombs were built into the side of a mountain so that ancient angels could reach the dead.

If you’ve ever seen a picture of Machu Picchu, then you’ve seen a picture of Huayna Picchu—you just didn’t realize it.

This pair of Australian "waterfalls" appear to be falling straight across the land.

A stray meteor left this picturesque hole in the Australian outback.

This magnificent Crimean estate was once a playground of the Russian elite.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

A stunning silver lining to global warming's gloomy cloud.

Breathtakingly blue walls shimmer inside the "Glacier Behind the Town."

A magical place that lets you play in and explore the world of Studio Ghibli.

On Japan's Tashirojima Island, cats are king.

An alien landscape on the banks of the Aegean Sea.

In Twickenham sits a small whitewashed castle that inspired Mary Shelley's 'Frankenstein.'

A place as enchanting as the journey to reach it is harrowing.

This cluster of little wooden huts once ground local farmers’ wheat into flour during the days of the Austro-Hungarian Empire.

In terms of history and architecture, this is one of the most remarkable cemeteries in the world.

A grand imperial capital left to fall into magnificent ruin.

A vast, otherworldly collection of Buddhist stupas.

These phallic stone spires once served as Tolkien's Paths of the Dead.