This unusual subway stop was originally a real estate office.

Hidden in a hotel parking lot is a strange historical plaque erected by an obscure fraternal society.

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

This park is home to well over 100 handmade birdhouses.

Hiding in plane sight.

On the right bank of the Grand River a plaque remembers an imaginary painter who once awaited his youth.

On the shores of Lake Kalamazoo, a plaque marks a fictional event where an island nation ran aground.

The Pentagon sits on a former island that was in Virginia at low tide and D.C. at high tide.

A relief that wraps around the concourse of Los Angeles's World Trade Center marks one of the city's failed urban design plans.

Color-coded signs direct drivers on a network of routes designed to avoid Pittsburgh traffic.

This memorial includes fragments from one of the greatest tragedies in United States history.

Twenty-three trees, each paired with a basalt stone, line a street in Chelsea, continuing an urban project started by German Fluxus artist Joseph Beuys.

A Winnebago Tribe collection featuring arrowheads, artwork, and a mysterious rock carving.

Outside Hope College in Holland, Michigan, a marker honors a University without people from the fictional Kcymaerxthaereal times.

Inside, visitors are treated to the rich history of sugar farming and its impact on Hawaiian society.

This statue of Olympic hockey coach Herb Brooks immortalizes one of the greatest moments in American sports history.

A historic, century-old house plopped along the perimeter of Houston's ballpark.

A pair of black granite tails dive into a sea of grass in landlocked Vermont.

A mile-long audio-guided walking tour preserves an iconic era of Portland soul music.

The former residence of Elizabeth “Mumbet” Freeman, an enslaved African-American woman who successfully sued for her freedom.

This Texas windmill field celebrates the power and majesty of the very winds that blow.

A historic hydroelectric power plant serves as the unusual backdrop for a public park.

Perfect your fly fishing technique on their practice ponds.

A unique local art exhibit that has continued to grow since 1989.