Infamous marsh filled with toxic waste, World War II-era London rubble, and dead mobsters galore.

Featuring the the longest lift span of any vertical-lift bridge in the world.

This historic lighthouse was well known for the large number of women who served as its keeper.

One of the oldest surviving Swedish-American homes in the United States.

The 28-foot granite map plots the locations of 40 theaters in New York City.

Perhaps the most scandalous statue of America's first president.

Air Force Academy Chapel made of 100 identical tetrahedrons works to inspire those of all religions.

A daily replay of the experiment that proved the rotation of the Earth.

Beautiful mosaics cover the first stations opened on New York City's newest subway line.

I-95's Tijuana-style celebration of kitsch at the Carolina border.

One of the few remaining American elm trees in New York’s Tompkins Square Park was the birthplace of a new religion.

A sculptural commentary on capitalism pokes up from the East River.

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

This industrial area was the dumping ground for massive amounts of trash, some of which washes up as tiny bits of sea glass.

A turn of the century building boasting some of the most beautiful art nouveau architecture in Prague.

Salute the leader of the proletariat.

The site of the deadly Triangle Shirtwaist Factory Fire.

This historic train station has been converted to a locomotive themed hotel.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

A downtown park built on top of unclaimed graves.

The final resting place of soldiers' loyal canine companions.

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

The remains of a community that was forced to move for a dam that never materialized still rot in this Pennsylvania park.

A working steam clock, one of only a few in the world, located in Vancouver's Victorian Gastown.