This unusual lava tube spouts seawater during high surf.

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

Incredible rock formations jut from the southern end of this spectacular stingray-viewing spot.

Once part of an ancient international harbor, it's now an all-you-can-eat shrimp buffet for flamingos and other water birds.

Few people have ever heard of, let alone visited, one of Turkmenistan’s most impressive natural attractions.

The fifth-longest natural arch in the world, and the longest outside China.

An underexplored, 130-foot tropical waterfall that you will have all to yourself.

Where the White Nile River dramatically cascades between Lake Kyoga and Lake Albert in Uganda.

Bioluminescence in the reefs of the Maldives causes the sea to glow like a starry night sky.

This dazzlingly turquoise mountain lake was created in the wake of a natural disaster.

This curious fresh and salt water lake holds a secret that draws in deep divers from around the world.

Squeezing inside this deep, narrow canyon reveals a festival of desert colors.

The ominously named cave is home to some remarkable ancient art.

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

The legendary giant's severed hand sits on Antwerp's popular shopping street.

Started as a kitchen garden, now the second largest botanical garden in the world.

An abandoned swimming pool decays on the outskirts of Berlin.