Orthodox church partially financed by Tsar Nicolas II.

Two plaques commemorate the site of Shakespeare's first theatre.

Scattered throughout London are ancient remnants of the city's former bounding wall.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

This landmark church concealed a crypt packed with bones that was discovered thanks to the London Blitz.

The signs of a long buried road can still be found hidden beneath a London sewer grate.

One part local history, 99 parts gruesome haunted house.

A strange rock in Chicago marks the spot where a tree once stood in honor of the 18th President.

This bronze sculpture on a former squash court marks the secret origins of the Atomic Age.

A hollow cement depiction of time's inexorable effect on the human body.

A tribute to Ponce de Leon's supposed quest for eternal youth.

St Bernard de Clairvaux Episcopal Church, better known as one of the oldest European buildings in the Western Hemisphere.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

A lone gunner's station is all that remains of a replica Spanish Fort in Florida.

This museum celebrating the almighty dollar lets visitors literally stand in the shadow of a million bucks.

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

A gothic church spire sits atop this skyscraper, the tallest church in the world.

A military museum and library dedicated to the citizen soldier.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

A little-known subterranean street runs under some of the best-known buildings in Chicago's River North.

Home to a protest movement, a bombing, and a dramatic change in labor history.

The palatial McDonald's that inspired Wesley Willis.