A galaxy of glowworms—larvae of a gnat—hides deep in the belly of these caves.

Some of the clearest water anywhere in the world.

Tubing through a cave lit with glowworms is a magical underground experience.

This small city where almost everyone lives in the same building can only be reached via North America's longest tunnel.

A trading post in the North Pole where children send letters.

The king of U.S. high points towers over every other peak on the continent.

130 replicas of world wonders squeezed into just 118 acres of space.

The largest dinosaurs in the world, kissing above the highway.

China’s breathtaking futuristic library is lined floor to ceiling with fake books.

The ancient settlement attracts tourists from all over looking to learn about the Chinese vision of the afterlife.

The most famous location in China was home to whole dynasties worth of imperial rulers.

This vertical pinnacle in China was the inspiration for the floating mountains in the movie “Avatar.”

A part of the world's largest marsh seems to be growing bright red Martian grass.

These brass bunnies honor the rabbits that dominated the no-man's-land around the Berlin Wall.

The largest whale museum in Europe allows visitors to walk among life-size giants.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

Hamburgers are intensely proud of their tunnel beneath the river.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

Residents of Berlin take their coffee and cake in one of the city’s most restful spaces: a cemetery.

This concrete residential area doubles as an open-air gallery.

The last remnants of a massive medieval wall that once encompassed the city of Berlin.

Berliners converted a bombed-out, disused lot into a community-run urban farm with its own cafe and bar.