The iconic Manhattan corner that was once the site of the Beastie Boys' fake clothing store.

A massive forgotten storehouse from 1913 on the Brooklyn Waterfront has a spectacular view of Brooklyn.

Unrepaired walls from a 1920 anarchist bomb attack.

The former hotel where Tesla invented the radio.

An artist's cute bronze subway sculptures belie his violent artistic past.

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

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

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

Elevated freight railway turned wildly successful urban park.

The sister plane of the C-123 shot down during the Iran-Contra Affair has found a new purpose in retirement.

Elaborate tile work in this railway station tells the story of Portugal.

A hidden three-foot-wide house separates these two regal churches.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

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

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

This enormous censer uses a pulley system installed over 400 years ago.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

Giant eggs, walls of bread, and nightmare surreality mark the largest collection of works by Salvador Dalí.

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

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.

Located outside Medellín, this Colombian park focuses on conservation and sustainability.

A celebration of Colombia’s premier contemporary artist.

Outdoor escalators and art have helped change what was once a notoriously dangerous part of Medellín.