Synagogue built from the stones of Solomon's temple contains the golem of Prague.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Macabre astrological automaton clock dating to the late 1400s.

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Hear the quietest sound from across the dome.

Famously misunderstood wonder of the ancient world

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

This memorial plaque remembers a strangely shallow maritime disaster known as "Chicago's Titanic."

What's left of the ruins of the 1893 Columbian Exhibition, or World's Fair, also known as the White City.

Purdue students would lean over this iron fence to skirt campus rules against smoking and courting.

A spooky and decrepit mental health facility is slowly being replaced with newer digs.

This peaceful Massachusetts graveyard was one of the first "garden-style" cemeteries in America.

This bridge was the birthplace of a unit of measurement based on a fraternity joke.

The massive machine creates cracking displays of indoor lightning.

Civil War Fort on an island in the Boston Harbor.

A cave dug by a man directed by ghosts to find pirate treasure.

"the sweltering inhabitants of Charleston and New Orleans, of Madras and Bombay and Calcutta, drink at my well . . . The pure Walden water is mingled with the sacred water of the Ganges."

An eccentric inventor's castle home with its own indoor weather system.

A daybeacon pyramid is about all that's left of this island that is said to have sunk due to a pirate's curse.

These unassuming lighthouses have seen the first reading of the Pledge of Allegiance, the first wireless transmission, and more than one mystery.

Eccentric concrete mansion and museum designed and built by hand from the inside out.