Among the busts of heroes of the Roman Republic of 1849, there is also a statue of a boy and his dog.

More sculpture than building, this architecturally significant temple was built on the spot of Saint Peter's crucifixion.

Brass cobblestones mark the places where individual Holocaust victims were taken from their homes.

A small cell adjacent to this church was once the bedroom for a renowned saint.

The final resting place of the poets Shelley and Keats.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

This hill made entirely of ancient Roman jars was simply a garbage dump to the people of the time.

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

Roman politician Herodes Atticus built this nymphaeum to honor his wife, whom he may have murdered.

2300-year-old Roman road connecting the empire.

This 16th-century monastery was founded to cloister the daughters of wealthy local families.

This striking arch, one of the first architectural elements constructed in Prospect Park, was recently restored to its original glory.

This metal eagle one of the final remnants of a newspaper that wanted to keep Brooklyn to Brooklyn.

This beautiful Brooklyn monument over a crypt memorializes a grim and largely unknown story from the American Revolution.

Ride the subways of yesteryear.

A popular European tradition makes its way to the states on one of America's most famous bridges.

The last living thing to come out of the rubble after 9/11 is now a symbol of hope and resilience.

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

An homage to Jackie Gleason's bus-driving character from 'The Honeymooners.'

This diesel train serviced the Brooklyn waterfront for more than three decades.

New York City's only wildlife rehabilitation center treats more than 3,000 feathered and furry patients each year.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

Wine bottle sculpture with a ship's stateroom inside.

Despite many attempts to finish this overpass, it has been abandoned since the 1970s.