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

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

Construction of Barcelona’s iconic (but controversial) church was finally completed in 2026—a century after the death of its architect.

The longest staircase lock in Britain.

This ruined castle is said to be the legendary keep of a Viking princess.

The location of this historic castle was inspired by a donkey.

The discovery of this Neolithic settlement, which contained a Stone Age "cathedral," threw archaeologists for a loop.

A close look reveals that the Scottish monument is just slightly off-kilter.

This extinct volcano rises above Edinburgh and is special for its panoramic views over the city.

Thanks to both terrific preservation and historic vandalism this ancient site is known as the "Heart of Neolithic Orkney."

Possibly the oldest of Britain's ancient henges is also one of its most stark.

A red sandstone freestanding monolith rises out of the sea in northern Scotland.

A church that bred legends, and served as an inspiration for the Da Vinci Code.

The highest peak in the United Kingdom has a history of physics, specters, and a pilgrimage of strange objects.

The true age of this ancient stone circle is unknown, but its stunning vista isn't in question.

Islanders once used this dramatic, otherworldly landscape to hide their cattle from Viking raiders.

Amazing and mysterious Neolithic settlement on Scotland's Orkney Islands.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

An ancient Scottish rock formation said to be the gravesite of a giant remains ensconced in legend and intrigue.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

Wild seas have created two spectacular formations just a stone's throw away from each other.

Let these towering termite-building structures tell you where to go.

A metal skywalk leads to the top of this striking granite outcrop in Porongurup National Park.

This Melbourne bank has unique Gothic-style architectural features and is one of the most majestic operating bank branches in the world.