These ancient giraffes are the largest known animal petroglyphs in the world.

A mountain range on an active U.S. Navy base hides thousands of mysterious prehistoric rock carvings.

A nature and cultural preserve named for its multitude of petroglyphs carved by the Northern Sinagua people.

This rock in the middle of a river in Jayuya contains dozens of Pre-Columbian Taíno petroglyphs.

This mansion oasis contains gardens, sculptures, and fountains just off the busy Plaça Kennedy in Sant Gervasi.

This amazing ancient cave was kept secret for seven years to protect it from the public.

This army of concretions is an unexplained geological phenomenon unlike anything else in the world.

Known for the tunnel that leads visitors to the water.

One of New Zealand’s few castles boasts beautiful gardens, grand architecture, and a history filled with family drama.

This striking royal residence is the largest Renaissance-style castle in Scandinavia.

This former royal palace with gorgeous gardens became the first museum in Morocco.

This extraordinary art museum is like a secret world on the edge of Mexico City.

King Ludwig I's collection of beautiful women.

The library houses an incredible collection of some of the world's most impressive books and manuscripts.

A magical museum of fairy tale treasures near Cyprus' buffer zone.

This cascade of mineral-rich hot springs and waterfalls is an oasis in the Jordanian desert.

A cluster of historic bathhouses built on the famed hot springs that gave the Georgian capital its name.

Rock-hewn monastery complex with hundreds of cave structures tucked away into the mountainside.

An Aztec temple, the largest man-made pyramid in the world, sits buried in earth with a Spanish church set on top.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

Monasteries on rock pillars, once accessible only by frayed ropes.

Rainbow-hued in the summer and crystalline in the winter, this salty lake has inspired battles, temples, and plenty of awe.

This serene, turquoise lake in an extraordinary nature reserve showcases a rare natural phenomenon.

This unusual lava tube spouts seawater during high surf.