An underground spring in a labyrinthine cave system, decorated with stalagmites and stalactites.

Once believed to be a sacred Roman legionary symbol, this bronze figure inspired the 1954 novel 'The Eagle of the Ninth.'

These mosaics were created more than half a millennium ago and feature various animals.

This Gothic revival structure has been a family home, a military base, a gymnastics center, and is now owned by one of the largest auction houses in Italy.

This charming stone church on the shore of Lake Tekapo is an icon in astrophotography.

A working steam clock, one of only a few in the world, located in Vancouver's Victorian Gastown.

A walk along this white sand beach creates a symphony.

These 2000 year old remains of a Roman aqueduct are hidden inside a hotel lobby.

A mysterious suspended hand greets unsuspecting visitors at the Tower of London.

A historic and beautiful Art Nouveau chamber in a historic railway station.

If there's another drive-through golf-cart bar in a bat-filled cave on top of a mountain, we don't know about it.

Rich red almandine gemstones are waiting inside the volcanic rock strewn across this eastern Nevada hillside.

The Avenue of Mausolea is a series of grand palatial tombs.

In 1909, the steepest and most difficult piece of track on the Canadian Pacific Railway was replaced with a series of spiralling tunnels cut into the mountains.

This church was constructed on the site where St. Philip the Apostle preached to the ancient Athenians.

This unusual sculpture is sometimes partially, sometimes fully, submerged.

Towering earthen formations that rise straight out of the ground in New Zealand .

Look up from the busy streets to discover how time is kept!

Twenty carved heads in Glasgow take a comical, modern twist to the medieval apotropaic, avenger of evil.

A historic bridge no one is allowed to cross.

The ruins of an 18th-century mansion that was once named "Mistake" by the man who had it built.

Despite what a Thai tourism board might want you to think, this white-sand beach is in fact located on a Scottish island.

A rebuilt Roman city that was once the largest Roman settlement in the region.

The first statue to be added to Saint Peter's Square in over 350 years is an ode to migrants and refugees around the world.