A massive, heart-shaped, wind-carved crater in the middle of the Israeli desert.

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

This full-sized orange tree lives suspended in mid-air above the streets of Jaffa.

The only quarter of the Old City not dedicated to a major world religion.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

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

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

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

A hidden church in a hidden courtyard tells the story of the Miracle of Amsterdam.

Amsterdam's narrowest house facade is a monument to 17th-century tax evasion.

Amsterdam's former hotspot for public executions and dissections.

A public urinal so pretty, it was declared a national monument.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

The attic of a four-century-old canal house hides a clandestine church.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

This "floating railway" is one of the world's oldest monorail systems.

When the rain falls, this drain system turns into a musical instrument.

These former Nazi anti-aircraft towers offer a singular view of the north of Berlin in the summer, and a sanctuary for bats in winter.

Dress up like a miner and take a slide into the disco-lit depths of this once foundational salt mine.

The industrial monstrosity known as Bagger 258 is a colossal mining machine built in the DDR - but now left for dead in a German field.

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

The 1852 novel "Uncle Tom's Cabin" lends its name to a subway station, a street, and several shops on the edge of Berlin.

A traditional U-Bahn station in Berlin gets a string of rather untraditional benches.