One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

This extinct volcano rises above Edinburgh and is special for its panoramic views over the city.

Deep in the limestone cliffs of the Alabaster Coast, a German fortress built during World War II.

An underground city of ancient quarry tunnels hid thousands of Allied soldiers in WWI.

A Paisley park where little has changed since its early 20th-century creation.

Stone monkeys adorn the buildings of this former estate.

Dummies recreate radiological discoveries from history.

A mysterious pair of mice eating a piece of cheese is London's smallest public sculpture.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

A mere stone's throw from Islamabad exists a spectacular display of three millennia of humanity's progress.

These stairs were built to accommodate royals mounted on elephants.

Known as the most dangerous bridge in the world, the Hussaini Hanging Bridge is only one of many precarious rope bridges in Northern Pakistan.

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

Climb this overlooked gem's spiral staircase and you'll be rewarded with spectacular views of Glasgow.

A scattered trail of street art adds a pop of color to the city's stark structures.

Glasgow's own "tipsy" temperance monument.

This two-legged horse statue celebrates a beloved cartoonist and his quirky characters.

Hidden on a cobblestone street in Glasgow, a Czech Cajovna-inspired teahouse serves as a hangout for Bohemians.

A mysterious ruin shrouded in more folklore than fact.

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

A familiar otherworldly creature guards this 12th-century Scottish abbey.

A historic shipbuilding town is home to a sail-through fish-and-chips shop.

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