Thousands of rusting train cars have been slowly falling apart on the edge of Greece's second largest city.

Taking the subway here means doing so over a bridge located in the middle of an estuary.

A fountain standing as a testament to a doomed alliance.

This crucial gathering spot along the "hippie trail" still displays old notes between traveling beatniks and backpackers.

A gorgeous, Gaudí-esque stairway constructed in the city of Istanbul by a prominent Jewish family.

A marvel of Byzantine engineering under the streets of Istanbul.

Hundreds of notes give thanks to the patron saint of lost causes.

Legend says this is actually a heartbroken prince waiting for his true love's kiss.

A statue honors the children who fought Nazis in Poland.

A menacing statue of this mythical creature can be seen at the legendary site of the monster's lair.

A program of Communist glamour in post-Stalin Poland is preserved in this colorful museum.

After the famous composer died in Paris, his sister snuck his heart out of the country to honor his wish that it be buried in their native country.

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

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

This easily overlooked memorial immortalizes the scars from the 1956 Hungarian Revolution.

A 13th-century convent where St. Margaret of Hungary spent her teenage years.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

One Portuguese poet described this cape, the westernmost point in mainland Europe, as "where the land ends and the sea begins."

A unique seaside cave where Aleister Crowley faked his own death.

At night, bats patrol this magnificent 18th-century space in search of book-eating pests.

The corpse bride of Portugal.

A fortress off the West coast of Portugal that dates back to 1502.