A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

A spectacular cave and a beguiling lake.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Devoted Buddhists can earn enlightenment in the next life by crawling through this symbolic nostril.

Peace Park and the Atomic Bomb Dome.

A plaque marks the site directly below the mid-air detonation of the atomic bomb over Hiroshima.

Japanese national treasure originally built in 593 CE.

The 10,000 Torii shrine.

This massive wooden building contains a giant Buddha, healing pillars, and tame deer wandering the grounds.

The yawning maw of this pagan visage is said to bite off the hands of liars.

A bit of retro transportation flair preserved in the world's largest department store.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

A semi-scholarly approach to sex.

Eighty million natural history specimens call this gargantuan museum home.

Fascinating town where normal life interfaces with the occult.

The largest greenhouse in the world is home to over one million types of plants.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

Sometimes an island, sometimes a rocky outcropping connected to the world by a tiny suspension bridge.

This Welsh village gave itself a ridiculous name in a publicity stunt a century ahead of its time.