Hundreds of bras, blowing in the wind.

Handcrafted thermal spa washes away each night with the tide.

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

Major tourist destination known for its bubbling mud-pools and hot thermal springs.

The glacier tucked within a New Zealand rainforest.

A glacier pocked with ice caves and surrounded by rainforests.

A perfect turquoise lake colored with glacier dust.

A solitary tree has grown up all alone on Lake Wānaka, backdropped by the beautiful Southern Alps.

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

Some of the smallest works of art in existence.

No one knows who built this strange cave of worship or exactly why.

The romantic botanic tunnel feels like a well-kept secret.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

This fairy-tale castle would make Dracula (who is said to have been imprisoned there) jealous.

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

There's a mini version of Iguazu Falls hidden in the Balkans, and it's got a rope swing.

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

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

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

A marvel of Byzantine engineering under the streets of Istanbul.

The railway carts travelers to central Athens's highest peak, which offers stunning vistas of the city.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

Now a hotel, this former bank was the site of a robbery that spawned a psychological phenomenon.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.