A park with one large cat sculpture and 15 smaller ones, all painted by different Colombian artists.

Unparalleled stargazing, one of Colombia's best observatories, and a swimming pool can all be found in the middle of this ancient tropical forest.

A self-taught astronomer fell in love with the stars and built his own observatory in Colombia.

This collection of ancient, mountaintop, underground tombs was once hidden by decades of bloodshed.

The world's tallest palm trees look like the whimsical kind of plant you'd find in a Dr. Seuss story.

Would you dare to dangle from a great height in a wooden basket?

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

The fishing boats that moor in this small lagoon enter and leave through a tunnel to the sea.

This prison on the Maltese island of Gozo is almost 500 years old, and they have the graffiti to prove it.

These temples are among the oldest free-standing stone buildings in the world.

This spectacular dome managed to survive after being bombed in World War II, in an event known as the "Miracle of Mosta."

Burial grounds for more than 1,000 bodies deep under the modern town of Rabat.

Four alabaster giants contemplate the tides on the shore of Denmark.

Remnants of the Nazis' occupation of Denmark linger along the sand.

A walkable map of the world, made from soil and stone by one man.

Denmark's famous pseudo-hill.

An enormous playhouse designed to look like 21 stacked Lego bricks, with another 25 million colorful Legos inside.

The original home of the Lego has a huge amusement park dedicated to the iconic plastic toy.

Mounds, rune stones, and a 1,000-year-old church, left behind by Denmark's first two kings.

A natural wonder in south Denmark.

An air of mystery pervades this modern-day singing Stonehenge.

It might look like just a pile of sticks—because it is. But there's a dark history to how this stack got its start.

The northernmost point in Denmark is a turbulent sandbar created by two clashing seas.

Tiring of digging out the door to this church for every service, it was eventually abandoned to the sands.