This mill on Lake Erie appears to shrink as a viewer approaches thanks to an optical illusion.

Niagara Falls holds a special place in Nikola Tesla's history, so they put a statue on it.

One of many reminders of Tesla's scientific contributions overlooks the falls which inspired him.

Soaring over the Niagara Whirlpool since 1916.

A natural gas leak provides a flickering flame beneath a waterfall.

A huge musical sculpture and other art installations on the National Oceanic and Atmospheric Administration grounds.

This semi-secret garden in south Seattle emulates a traditional Japanese garden using the plants of the Pacific Northwest.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

A self-made museum in Queens, New York continues to display the work of a sculptor known for paving his own way.

Private collection of art inspired by cabinets of curiosity.

This striking art museum holds an amazing series of curiosity cabinets.

Seattle's own bad art museum located inside Cafe Racer.

America's greatest forgotten garden and the former stomping grounds of Son of Sam.

Self-sufficient greenhouse floating on the Hudson River.

A miniature rainforest is growing inside of a Midtown Manhattan office building.

A rotting tree in the middle of Seattle doubles as an elaborately-controlled art piece.

A giant Troll lurks under one of Seattle's oldest bridges.

Monument to a forgotten NYC disaster that claimed the lives of 1,000.

The first "Hall of Fame" in America was designed by legendary Gilded Age architect Stanford White for what was then the NYU uptown campus.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

The longest continuous underwater road in North America was built at the insistence of Franklin Roosevelt.

One of only two commuter aerial tramways in the United States.

Elevated freight railway turned wildly successful urban park.