Avoid gangster interaction while window-shopping.

This plot of old-growth forest is the largest surviving remnant of New York City's original woodland.

Magnificent New Deal Murals evoke a time when New York City harbor was one of the world's greatest and busiest ports.

The home of one of America's most wealthy industrialists is now a historic site that remembers a more decadent time in the country's history.

One of the earliest bowling lanes in the U.S. doubled as a sewing school during a time when women had little job opportunity.

The sculptor was instructed to add “stallion attributes” to the general's bronze mare.

Home to a vast and influential collection of Shakespeareana.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

A drab two-story office space in Delaware is a hidden tax haven for Hillary Clinton, Donald Trump, and over half the Fortune 500 companies.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

Manhattan's Thirteenth Avenue was made on landfill then deliberately destroyed — apart from one small, obscure block.

A dilapidated dock tells the story of Titanic's missed arrival.

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

A beautiful collection of architectural ornaments rescued from demolished New York City buildings.

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

Once thought to be the fabled Holy Grail, it is now known to be an oil lamp.

This English-inspired Maryland garden is home to acres of opulent plant life including bushes shaped into an entire fox hunt.

Step inside Lucy, the world's largest "elephant."

The Hudson River School comes alive at this palatial estate.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

An indoor miniature village and labor of love for Laurence Geiringer, a model railroad enthusiast.

An outlandish shoe shaped house built by an eccentric millionaire.

These tourist trap caverns are said to be the former home of a legendary Pennsylvania Hermit.

100 massive sculptures in the Hudson River Valley.