This tiny island featuring 9th-century Viking ruins is only accessible at low tide.

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

This tin chapel was built by POW's during World War II and is painted to look like something much more grand.

A monument to a Russian cruiser near its final resting place off the Ayrshire Coast.

Legend says this rock spire is the finger of a witch who wanted to throw the Faroe Islands towards Iceland.

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.

Next to the Leaning Tower of Pisa is a cemetery home to ancient sarcophagi and disturbing murals.

This picturesque horseshoe weir was first built in the 1600s to prevent flooding in the town of Bath.

A museum that cashes in on its infamous little people while teaching you a thing or two about the Irish fey.

Northern Ireland's Brobdingnagian stepping stones.

This short bridge is the only thing connecting a tiny Irish island to the mainland.

Instead of solid circles, the stoplights in this northern Icelandic town have glowing red hearts.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Iceland's tribute to its thankless civil servants.

This stunning concert hall has become a symbol of Iceland's national recovery.

The largest whale museum in Europe allows visitors to walk among life-size giants.

A remarkable feat of Victorian engineering across the Firth of Forth.

Though it looks like a golf ball teed up for a hit, this hilltop station is actually used to monitor air traffic.

The last water-powered beam pumping engine in Britain.

Largest lake in Great Britain measured by surface area.

A local tree surgeon has created a whimsical walk full of carved tree stumps near Scotland's Loch Lomond.

This volcanic plug boasts the longest recorded history of any Scottish stronghold.

Wonderfully preserved Victorian factory, complete with a preserved steam powered engine house.