This elaborate tunnel is the first structure composed of cast concrete in the United States.

A tree that grows parallel to the ground was declared Brooklyn's "crowning curio" by the poet who saved it.

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.

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

This New York florist also sells traditional tofu pudding.

This quiet, scenic spot was once a busy resort paradise

Preachers and shipbuilders collaborated to create a place of worship in this island community

The most confusing clock in New York.

No monkeying around, this fountain was really named after the classic sci-fi film.

A menagerie of concrete animals brought together from across New York City's parks.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

This stately brick building once provided supplies and equipment to lighthouses across the northeast during the 19th and 20th centuries.

A restaurant on Staten Island showcases a different grandmother’s cooking every night.

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

An accidentally hidden library containing the ephemeral history of New York.

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

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

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

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

A free park where visitors can learn about and collect 440 million-year-old fossils.

This awkward aquarium sculpture is one of the strangest statues in Chicago.

Illegal drag racing two stories beneath Chicago’s streets.

These murals have been brightening a Chicago beach for more than 30 years.