Medicinal spa created with the discharge from a geothermal energy plant.

This black church sits alone among a field of lava rock.

This scenic Icelandic lava flow is named for a pair of Berserkers who were murdered, according to a famous Saga.

At this museum in Iceland, visitors can sample fermented Greenland shark.

"A hideous albatross in the Hudson River Valley."

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

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

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

You must take the A train... to the last active cemetery in Manhattan.

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

This curved Manhattan building was built to house the opulence of John D. Rockefeller's oil empire.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

Built hundreds of years ago this downtown iron barrier once protected a much despised king.

Where now stands a 42-story condominium tower of marble, glass and steel was once the central market of New York’s slave trade.

This subterranean oyster house has been the pearl of Grand Central Station since 1913.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

A curious fountain that has no water and includes Satan, a crab, and 9 giraffes.

Unrepaired walls from a 1920 anarchist bomb attack.

Avoid gangster interaction while window-shopping.

Visit the monolithic tomb of America's most famous general.

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

The fanciest public restroom in New York City boasts fresh flowers, art, and a classical music soundtrack.

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

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