America's most famous piece of self-built architecture.

A 140-year-old castle with underground caves hidden in San Francisco.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

These quintessentially English stepping stones were built for Victorian tourists.

This tiny Swedish troll protects the land and all who wander within it.

The biggest onshore wind farm in the United Kingdom.

The most northern place on the mainland of Great Britain.

British Empire's last territorial expansion, claimed by four countries.

Water-themed sculptures guard this unusually square structure.

Some cheeky plantings brighten an old slipway on Scotland's Firth of Forth.

This hill nestled in the Scottish lowlands was a ritual site for over 4,000 years.

A leafy, peaceful oasis nestled in the heart of Glasgow's busy south side.

Originally intended as a temporary installation, this sculpture is now a permanent part of a stunning Scottish beach.

This tiny island is home to the world's largest colony of Northern gannets.

On a remote island, legend has it that a fiddler and his wife were turned to stone.

An 18th-century lighthouse built on a 16th-century castle is now a monument to the maritime beacons of Scotland.

A sea cave with a waterfall and Viking past

Scotland still bears an enormous scar of its Roman past.

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

This seaside Scottish holiday rental lets you live out your bookselling dreams.

A trio of giant megalithic stones in the middle of a golf course.

The U.K.'s first underground railway line is now a lively thoroughfare for runners and cyclists.

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

This Birnam-based garden honors the legacy of 19th-century children’s book author Beatrix Potter.