This beautiful 19th-century temple stands atop the ruins of its predecessor.

A small square plaque marks a failed assassination attempt that could have changed history.

A subterranean display of public art and architecture.

An abandoned train station in Munich constructed for the 1972 Olympic games.

This century-old cinema house has a marquee that has been hand painted by a single man for over 25 years.

The scars of World War II are preserved on its walls.

This museum explores the history of the city's public transportation. Its collection includes the world's oldest preserved electric trolley car.

The sweet story of how American cargo planes became known as "Candy Bombers" during the Berlin Blockade.

Metal horses galloping through a London fountain provide a link to the city's past.

One of America's founding fathers lived in this London lodging between 1757 and 1775.

William Smith's iconic "map that changed the world" is hidden behind a curtain in the Geological Society building.

The Tudor-style cottage in the middle of the square is not quite what it seems.

One of the few remaining examples of 19th-century London’s attempt to clean up its reputation.

The sculpture of the deceased cockatoo flops atop its personal plinth.

Lovers proclaim their unbreakable bond by leaving their names on locks fastened onto the Shoreditch fence in East London.

Bronze sculpture celebrating the relationship between Churchill and Roosevelt.

The television series' iconic giant foot was borrowed from this classical painting.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

France's national museum of scientific and industrial instruments.

This massive library holds what was once the largest book collection in the world.

This 220-year-old house is a reminder of New York City's Dutch past.

A prized globe signed by Amelia Earhart and Charles Lindbergh sits in the Brooklyn office of the American Geographical Society.

A famous songsmith's custom piano, dubbed "High Society," is hidden just out of sight in one of New York's finest hotels.