400-year-old garden, restored to beauty.

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

A fantastic castle rumored to be the birthplace of King Arthur.

France's national museum of scientific and industrial instruments.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

Hear the quietest sound from across the dome.

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

Three bridges and one giant canyon make up this fantastic Spanish settlement.

Quite simply the largest tree in the world (by volume).

The longest hedge maze in the world.

Eighty million natural history specimens call this gargantuan museum home.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

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

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

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

An ancient capital city that dates back 3,000 years old and harbors many surprises.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

Famously misunderstood wonder of the ancient world

The site of the climactic scene from the classic horror film is now a historic landmark.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

Elevated freight railway turned wildly successful urban park.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.