Spies, love letters, and ghost stories have all left their mark on this home-cum-museum.

At Monet's beloved home you can still see the Japanese bridge, waterlilies, and weeping willows that were the subjects of some of his most iconic paintings.

A self-made museum in Queens, New York continues to display the work of a sculptor known for paving his own way.

The front yard of an Upper East Side town house hides the last fragment of one of New York's most famous theatres.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

A naturally mummified 2,000-year-old man.

Museum dedicated to literary greats of the Romantic Period is also the home in which Keats met his untimely end.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

A Nesting Doll of Churches.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

The underground sanctuary of a mysterious ancient cult.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

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

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

The oldest and smallest cemetery in Paris is only open to the public twice a year.

Wine bottle sculpture with a ship's stateroom inside.

Mysterious 500-year-old tapestries depict a unicorn hunt.

Named the fifth most beautiful building in America in 1885, this former courthouse boasts the best view in the Village.

One of the most enjoyable bits of history at Coney Island and “the most romantic ride in the world.”

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

You can still ride this 100-year-old work of art in Brooklyn's largest public park.