Located in the thermoelectric factory that once powered the entire city, this Portuguese museum is shockingly fascinating.

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

An early Portuguese serial killer's head is alarmingly well preserved in a jar at the University of Lisbon.

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

Portugal's National Pantheon has a history of curses, collapses and financial problems.

This tile-work piece featuring a chicken riding in carriage is both a remarkable artistic creation and a social commentary of politics and culture in 17th-century Portugal.

The big toe of this towering monument to a Croatian national hero is worn from years of superstitious rubbing.

When a supermarket opened up shop within a medieval building it became protected by UNESCO on a technicality.

A unique gallery chronicles the losers of American presidential history.

This secret collection of the strange and occult was rediscovered in a forgotten room of an old house.

The greatest amusement park in the world is wall-to-wall farting dogs, puking rats, and cows with exposed breasts for the whole family.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

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

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.

Enjoy a slice while browsing the world's largest collection of pizza memorabilia.

One of the oldest of its kind.

Erected in 1697 this Philadelphia bridge is the oldest surviving roadway bridge and perhaps the oldest stone bridge in the United States.

Current docking place of the SS United States, the fastest transatlantic ocean liner.

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

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

This museum boasts a bucket of teeth and tells the tale of a 20th-century dental circus.

This meticulously extracted nervous system allegedly came from a 19th-century custodian who donated her body to science.