There are plenty of wonderful panoramic vistas in Edinburgh, but not many are hidden smack in the middle of the Old Town.

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

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

Once the most painted on object in the world, this short campus fence is well on its way to being so again.

Memorializing an American tragedy of massive proportions.

A park full of outsider art, created by college students studying outsider art.

A take-out restaurant that only serves cuisine from countries with which the United States is in conflict.

The last street in Pittsburgh that's paved with wood.

The largest clock face in the United States is twice the size of Big Ben and infinitely more ad-sponsored.

Meet your friends, marry your true love, or tell your enemies to kiss your butt under this historic Pittsburgh timepiece.

This Old Testament garden features 100 plants from biblical times.

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

One of the steepest streets in the United States makes an intriguing challenge for cyclists.

The last of Philadelphia's wood-paved streets is now a landmark of terrible engineering.

The humble field where the first Major League Baseball game was played.

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

Instruments, apparatus, and rare books all relating to chemistry and its related sciences.

The oldest surviving botanic garden in the United States.

A clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.

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

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

Huge masonic hall in Philadelphia with lavishly themed rooms.

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

A layered tribute to the work of mosaicist Isaiah Zagar.