Displaced highlanders would take shelter from the wet Scottish climate under the large walled bridge at Glasgow Central Station.

Early Medieval stones sit on display at the beautiful Govan Old Church in Glasgow.

A rare permanent monument to the Scottish Travellers.

This picturesque mansion has gone from opulent ruin to nature museum.

An ancient city hidden in the heart of the Sierra Nevada mountains.

Bali's remote "gateway to heaven" is one of the most sacred places on the island.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

Rainwater transformed this old quarry into a peaceful pond you won't find in most tourist books.

This geothermal hot spring hides beneath a slowly growing mineral dome.

The 43-mile route crosses through six islands with gorgeous views of the Seto Inland Sea.

A historic trade hub teeming with gorgeous architecture, colorful goods, and vibrant designs.

An ancient fortified mound raised over the millennia from settlements built one on top of the other.

The sacred shrine of the Yazidis.

The surviving pieces of an ancient aqueduct that may have fed into the lost Hanging Gardens of Babylon.

This beautiful system of tunnels built into natural rock serves as a centuries old plumbing system.

9th century Abbasid mosque, damaged in modern warfare.

This beautiful arched gate is all that remains of the fortress the ancient mountaintop town of Amadiya once was.

This fantastical waterfall is hidden in a cave located in a cracked cliff.

Strange rock formations tower above the river that snakes through this enchanting Icelandic canyon.

A treasure trove of astronomical, mathematical, and scientific instruments at Cambridge University.

A complicated contraption for telling time by the moon.

The Cambridge pub where Francis Crick announced that he and James Watson had discovered the DNA double-helix.

A remarkable medieval structure born from a 14th-century disaster.

An elaborate Mayan city shrouded in alien conspiracy revealed the tomb of Pacal the Great.