If you fly into Edinburgh Airport, it's possible to spot this prehistoric site without even getting off the plane.

This mundane post marks the old location of the city's main postal hub.

A remnant of the Roman army's presence on the coast of Scotland.

This king penguin is a knighted brigadier of the Norwegian Army.

A beautiful Greco-Roman structure houses a well once believed to have healing powers.

This obscure walkway links Edinburgh’s Old Town with one of the city's prime vantage points.

The taxidermy remains of the first mammal ever cloned from an adult cell are on display in Edinburgh.

Accessible only at low tide, the deserted island is dotted with World War II ruins.

Semi-precious Blue John stones have been mined in this cavern system for centuries.

A magnificent winding road through a steep valley, with deep natural caverns at the bottom

Some of England's last cave dwellers lived and worked within this huge cave.

Once the largest unsupported dome in the world, beating out the Pantheon and St Peters in Rome.

A historic Georgian building and warm springs.

These unique stepping stones hug a river's edge to take hikers on a journey through a limestone gorge.

A 17th-century church is nestled within the walls of a 15th-century ruin.

A quartet of rusting satellite goliaths are all that remain of a communication network that protected Britain from German and Russian air strikes.

This memorial pays homage to the Royal Air Force squadron that breached two important dams during World War II.

It's believed King John of England stayed at this 13th-century castle before riding off to sign the Magna Carta.

This grassy, tree-lined hill shares a name with the much-loved novel that it inspired.

The "father of immunology" used this humble hut to offer the local people some of the world's first free vaccinations.

You can crawl inside this atmospheric 5,000-year-old tomb.

Home to the ancient Roman temple of a lesser-known Celtic god that inspired J. R. R. Tolkien and H. P. Lovecraft.

You can enjoy a (possibly haunted) stay at the medieval Norman castle that was once a favorite hunting lodge of King John.

Archaeologists are still unraveling the secrets of the brutal massacre that wiped out this ancient fort.