This fantastical waterfall is hidden in a cave located in a cracked cliff.

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

Rent out a glass igloo to watch the Northern Lights like you live in the future.

One of the world's oldest olive trees, thought to be over 2,000 years old.

An ethereal glowing blue ocean cave in Croatia.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

Rocky Atlantic beach home to a stunning stone arch.

It took 40 years to build this Eden-like garden in Marrakech, later restored by Yves Saint-Laurent.

Founded as a refugee camp, now a popular tourist spot.

Morocco's Argania trees are infested with nut-hungry goats.

World's strongest whirlpool.

This hilarious English intersection is an automotive whirlpool.

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

Natural cathedral designed by Italian artist Giuliano Mauri.

This exclusive resort has completely covered a tiny Balkan island in a 5-star warren of guest rooms.

Moss and stone turn this waterfall into an otherworldly liquid veil.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

Roman ruins top white travertine terraces formed by ancient hot springs.

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

A harrowing trail up a mile-high mountain.

The oldest Buddhist monastery in Mongolia has survived centuries of invasions, political shifts, and religious purges.

A secret climbing tree hides along the side of a Costa Rican road.

Where dogs like the rare "Fire-Tailed Border Cocker" run free on the mountainside.

This neon blue river gets its color from a unique mix of bacteria and volcano minerals.