A free public golf course hides in plain sight in the heart of Scotland’s capital.

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

The last remaining bottle-shaped kilns in Scotland stand alone in an Edinburgh suburb.

This alley off Edinburgh's Royal Mile contains remnants of the city's seedier history.

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

Sprawled across the Great Hall ceiling are various constellations and images relating to the zodiac.

Touching this 18th-century Scottish philosopher’s toe allegedly conjures good fortune.

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

A verdant 17th-century-style garden hidden along Edinburgh’s Royal Mile.

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

This otherwise ordinary close on the Royal Mile constituted the end of the world for Edinburgh’s poorest residents.

An American ghost town hides along a side street in Scotland's capital.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

A sweet symbol marks the place where torturous executions were once carried out.

This series of Scottish caves has no clear purpose other than baffling historians.

This cramped crevasse saw the entire population of its island suffocated inside its depths.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

Rare collection of medieval books under lock and key.

The largest known medieval map of the world.

The elaborate clockwork contraptions in this Scottish gallery create small worlds of whimsy and horror.

The world's oldest surviving music hall was also once a freakshow.

This stately monument has been wearing a traffic cone hat for decades much to the delight of the locals.

Largest lake in Great Britain measured by surface area.

A 200-year-old collection of oddities and medical paraphernalia.