Thousands of coffin-like pillars make up this controversial Holocaust memorial.

Cold war icon and onetime "hole" in the iron curtain.

This open-air heritage museum illuminates centuries of historic English life from a West Sussex village.

A Victorian Fort built into the chalky cliffs that overlook the English Channel.

A small collection of iguana-infested ruins hides amid Cancún's bustling hotel zone.

A Trabant car, a kangaroo statue, and a plethora of plants take over this abandoned-factory-turned-bar.

A beautiful ruin of a 14th-century Plantagenet castle built by a medieval mercenary.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

Huge concrete structures designed as an early warning system for Britain to detect enemy aircraft.

This striking observation tower shaped like a spinnaker sail is the newest icon in historic Portsmouth.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

England's oldest surviving hedge maze has been confusing visitors for over 300 years.

Shakespeare, David Bowie, Dr. Who, the Saxons, Druids and Romans are all claimed to have all made their mark on these massive man made tunnels.

This giant geoglyph of mysterious origins is now the site of neo-pagan rituals.

The remnants of a strange stilted building on rails can still be seen at low tide.

This craggy boulder is fabled to be either a druidic relic or Satan's stumbling block.

The rotting skeleton of a shoreside fun fair that was destroyed by fire and storms still haunts the Brighton ocean view.

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

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

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.

Week-long block party becomes a competition for the best decorated street.

The fishing boats that moor in this small lagoon enter and leave through a tunnel to the sea.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.