A section of the long chain that blocked enemy ships from entering Constantinople.

No one is sure if the world's fourth-largest diamond had been found in a rubbish heap or was pawned by Napoleon's mom.

A sixth-century Byzantine cistern hidden below a modern carpet store.

Mural made of 100,000 pieces of hand blown glass, and one of the largest glass murals in the US.

America’s smallest national park site is the former residence of exiled Polish national hero Thaddeus Kosciuszko.

At 135 years old and counting, this historic print shop is heaven for poster nerds and music buffs.

This replica of the Greek structure is in the heart of Nashville.

The alley connecting two of country music’s most historic venues has a rich history of its own.

The largest stone circle in Ireland.

It's said this was once the home of King James V's pet lion.

A roadway designed for a visiting monarch.

The Scottish Reformation leader's grave was paved over and is now a parking lot.

The 20th-century chapel’s intricate woodwork includes amazing details, most notably angels playing bagpipes.

A six-ton wedding present for the King of the Scots.

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

This early version of the guillotine was used to execute the man responsible for its construction.

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

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

Old-fashioned knowledge and modern engineering create the world's only rotating boatlift.

This allegedly haunted 16th-century tower house-turned-museum exhibits thousands of spectacular objects.

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

The heads of two giant mythological water horses honor Scotland's horselord past.

The one-time stronghold of the noble Douglas family, now home to ghost sightings and nesting birds.

A church that bred legends, and served as an inspiration for the Da Vinci Code.