An ancient Scottish rock formation said to be the gravesite of a giant remains ensconced in legend and intrigue.

Amazing and mysterious Neolithic settlement on Scotland's Orkney Islands.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

A unique sculpture park that specializes in the huge and bizarre.

Contrary to popular belief, this secluded statue doesn't represent Pennsylvania's founder.

A tour de force of a fountain, memorializing a man who loved fountains more than anything else.

A daily replay of the experiment that proved the rotation of the Earth.

The sounds of the world's largest fully functioning pipe organ dazzle shoppers at a Philadelphia Macy's.

The body of St. John Neumann and his collection of hundreds of relics, on display in a Philly church.

This elaborate towering structure was once famed for its revolutionary height.

Yo, Adrian!

The first American department store, and home to the largest operating musical instrument in the world.

Dr Barnes' $25 billion private collection of art and arboretum.

This little-known collection holds everything from "Dracula" notes, to the manuscript of "Ulysses," to the forged works of Shakespeare.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

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

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

360° views of the city plus five floors of optical illusions and hands-on science.

The mysterious canine hides atop a drain pipe on the back of the building, some say as a sneaky shoutout to Yale.

This stone tower marks a lookout point over the historic Washington Crossing, and maybe some buried treasure.

These 20-foot sculptures will help guide you from the local train station to the local sculpture garden.

A surprising museum of 20th-century technology.