A sulfuric martian landscape that looks far better than it smells.

The Avenue of Mausolea is a series of grand palatial tombs.

Curious cave that stays a cool 56 degrees all year long.

The most powerful waterfall in all of Europe.

Two geological phenomena in one precarious locale: a towering stone window, and a deep blue void.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Holy Hindu shrine in an enormous, monkey-filled limestone cavern.

Swarovski's museum/theme park is a fake diamond fantasia overlooked by a giant.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

The legendary cliffside castle of three-time Voivode of Wallachia, Vlad the Impaler.

A small town Romanian cemetery filled with darkly humorous gravestones.

The world's largest man-made underground caverns offer unparalleled underwater wonders.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

The final resting place of the poets Shelley and Keats.

A beautiful bamboo trail tucked in this famous Japanese Shrine.

This "second" cemetery represents New Orleans' attempt to keep cholera at bay.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

This one-time health resort was used by aristocrats around the world.

2300-year-old Roman road connecting the empire.

This elegant arc of a waterfall marks a religious turning point.

Amsterdam's Red Light District leaves little to the imagination.

Isolated atop this Balinese sea crag is a lovely Hindu temple that is said to be guarded by sea snakes.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Erosion and time have created a naturally-formed water park.