With some 500,000 books across five buildings, this bookstore is a reader's paradise.

Quirky castle designed by the American actor best known for portraying Sherlock Holmes on stage.

The ruins of an abandoned 18th-century town that is slowly being reclaimed by the forest.

A 19th-century architectural wonder designed by the "father of the skyscraper."

The seat of Buffalo government is a gorgeous Art Deco palace.

A natural gas leak provides a flickering flame beneath a waterfall.

The castle that provided the setting for much of 'Monty Python and the Holy Grail' is now a pilgrimage site for fans.

A pre-Industrial Age iron furnace and the site of a nearly-forgotten piece of Black history.

In the bowels of a 19th-century brewery lurks a fine-dining restaurant offering an array of themed feasts.

An award-winning children’s garden enchants visitors at the intersection of natural beauty and fairy tales.

Designed by the company that provided water to the entire community.

A fascinating community art piece created by students, teachers, and noted Philadelphia artist Isaiah Zagar.

In use from 1742 to 1910, only flat headstones were allowed in this cemetery.

One of the world's oldest continually operating bookstores.

George Washington, Alexander Hamilton, and Benjamin Franklin all slept at this humble inn.

The lasting remains of the region's once booming cement industry.

Come for the history lesson, stay for the mule-pulled boat rides.

This historic old movie house was the scene of one of the Blob's most iconic attacks.

This sculpture of a fisherman spent six years at the bottom of the Schuylkill River.

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

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

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

Huge masonic hall in Philadelphia with lavishly themed rooms.

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