This snug medieval lane is one of the narrowest streets in the world.

A fire once nearly devoured this gorgeous 14th-century Gothic cathedral.

This solitary monastery may hold the remains of Vlad the Impaler (but probably not).

This old KLM airplane cut into three parts was transformed into an eclectic airport gift shop.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

This monument marks the beginning journey of a wounded soldier's leg that ended up almost two states away.

The longest covered bridge in Delaware.

South Philadelphia is home to Keith Haring's only surviving in situ collaborative public mural.

Hidden behind West Philadelphia rowhomes is a haven for migratory and local bird species both ordinary and rare.

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

One of the oldest log cabins in America is one of the last of its kind this historic Swedish dwelling remains a piece of living history.

A beloved horticultural oasis on the grounds of a wealthy family's former estate.

An eccentric priest's tribute to George Washington, this chapel tells the story of the American Revolution.

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

Pennsylvanian mass grave and possibly mass murder.

This iconic Lancaster everyman has been reading the same story since 1980.

The first of Lancaster's "rural cemeteries."

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

Although built to generate electricity for Marylanders, this dam has become an all-you-can-eat buffet for American bald eagles.

The highest point in Delaware is located under a trailer so this marker across the street will have to do.

This little-known Revolutionary War fort is supposedly haunted by the ghosts of its past.

A heroic pigeon that, through a barrage of gunfire, delivered a message that saved over 100 lives in World War I.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

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