Spain's stunning solar energy plant.

Considered the birthplace of the Copper Age and Bronze Age, the river is tinted red from 5,000 years of mining.

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

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

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.

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

Nestled amid the peaks and lochs of the Scottish Highlands, this inn and pub has played host to outlaws and ghosts.

Largest lake in Great Britain measured by surface area.

An optical Illusion once believed to be an electrical phenomenon.

This modern labyrinth lies in the shadow of a ruined medieval castle.

One of Scotland's most important modern structures, it just made the '100 Most Endangered Sites' list.

This Scottish bridge seems to compel dogs to leap to their death.

Cascading waterfalls mark the gateway to the ancient burial place of Clan Macnab.

A small island abbey is the final resting place of many medieval Scottish monarchs, including the real Macbeth.

These quaint cottages feature built-in signaling devices for fishermen.

A bizarre stone beast lurks on the beach of a popular tourist island.

The biggest onshore wind farm in the United Kingdom.

This former football stadium seems almost abandoned but is still in use by the next generation of Scottish sports stars.

These semi-natural waterfalls hint at the park's Victorian-era industrial past.

Where the sleeping monsters of Scotland's oil industry are left to rust.

The sign marks one of the endpoints to mainland Britain's longest overland travel route.

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

Legends surrounding this megalithic tomb range from giants to a dwarf named Trollid.