An Orthodox church built by the Royal Family for the Russian community exiled to the French Riviera.

The construction of a tram line unveiled hidden remnants of the old medieval city.

Many famous English poets including Elizabeth Barrett Browning are laid to rest at this Swiss-owned cemetery in Florence.

Memorials at a Florence railway station remember the citizens who were deported from Italy and sent to extermination camps.

An extraordinary house museum and cabinet of curiosities in the heart of Florence.

The graveyard is filled with beautiful funerary art and boasts breathtaking views of Florence.

A Natural History and Science Emporium.

A simple midtown bar was once the home of a secretive and exclusive club staffed by "bunnies" under Hefner's strict rules.

A veritable variety of odds and ends.

Three-story slide through the New Museum.

Hidden in an ordinary Midtown building is a one-room museum dedicated to the greatest escape artist.

Tucked in the back of this amazing antique store is an important piece of medical history.

Home to a dizzying array of letterpress blocks with a rich history.

The home of the first American-born saint is one of the only curved buildings in New York.

This hidden oasis features a stunning view of the Hudson River and the Palisades from a castle-like museum.

Manhattan's deadly West Side railroad, which killed hundreds of New Yorkers, is remembered by this simple plaque.

This memorial honors thousands of enslaved Africans and their descendants who died in colonial New York.

This Manhattan museum houses one of the largest collections of Spanish art and manuscripts outside of Spain.

Revolutionary War casualties fill the only 17th century structure remaining in Manhattan.

Twice a day one of these tragic bronze mariners drowns with the tide to remember all those the sea has taken.

One of the city’s oldest watering holes was originally the home of a famous James Brown (not that one).

A plaque immortalizes the spot where the early American spy said his famous last words: "I only regret that I have but one life to lose for my country."

Church in Manhattan holds the bloody sock of Padre Pio, among with many other unusual relics.

The last remnants of what was once one of the world's grandest hotels can now be found in a Manhattan subway station.