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.

Oldest synagogue in the United States.

Mural made of 100,000 pieces of hand blown glass, and until recently, the largest glass mural in the US.

Enjoy a slice while browsing the world's largest collection of pizza memorabilia.

This hidden gem of a garden has one of the only surviving Victorian ferneries in America.

A surprising museum of 20th-century technology.

Home of Philip Johnson, one of the 20th century's most influential architects.

A tiny red pebble marks what may be the quietest outdoor spot in the United States.

A whimsical village of unique treehouses resides in a Washington forest.

A lone tower rises above the cliffs in a city park, offering fantastic views of the Connecticut landscape.

A reliquary of pop culture marvels, including the world's largest (and most terrifying) Jack-in-the-Box.

The Connecticut village named for its subterranean thunder.

The highest point in Connecticut was incorrectly memorialized before surveyors discovered the actual spot.

A small structure built from used railroad ties honors the short term of America's 20th president.

The highest point in New Jersey is marked by a massive, if simply named, obelisk.

A world-class collection of mechanical musical instruments and automata.

A unique sculpture park that specializes in the huge and bizarre.

Hundreds of glow-in-the-dark objects light up a museum in a historic zinc mine.

The right to a full beard is honored by the grave of a man who was attacked and jailed due to his facial hair.

The site of the first "historically true" UFO encounter in the U.S.

It's not a typo, now say it five times fast!

An old trolley bridge was converted into a breathtaking garden bursting with colorful flowers.

Locals purchased this abandoned quarry in order to make sure it continues to be overgrown.

The thousands of shades on display — some toxic, others impossibly rare — are a library of more than just color.