Mother Nature outdoes herself with this stunningly beautiful set of caves carved into marble.

A one-of-a-kind collection of a unique medium.

The sign at the garden gate reads: "These Plants Can Kill."

Medicinal spa created with the discharge from a geothermal energy plant.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

A towering tribute to decisiveness stands on the spot where Brigham Young and his followers decided that this must be the place.

Brightly colored 30-foot-tall totems light up the desert sky just outside Las Vegas.

The world's largest aggregation of great white sharks is at a mysterious spot in the middle of the ocean.

Sleep snuggled in a sphere suspended atop the forest canopy of Vancouver Island.

The long, arduous journey of the stones of the Abbey of New Clairvaux.

California's own medieval Italian castle, authentic down to the 300-year-old iron maiden in the dungeon.

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

This Japanese-inspired labyrinth of hot springs is hidden in a Chilean forest.

Pivotal home of Nobel Prize winner Pablo Neruda.

A beautiful deserted greenhouse in the middle of a park.

A record-breaking pool that uses computers to turn ocean water into cleaner, private swimming water.

Giant marble phalluses on the sacred island of antiquity.

The hallucinogenic center of the ancient world.

These fantastically named natural pools look like something out of a Scottish myth.

A makeshift shrine to the late rock star is still kept up on the nondescript façade outside 1 Logan Place.

This hidden rooftop garden in downtown London offers a quiet respite from a bustling city.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.