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.

The longest-covered bridge in the state of Maryland.

An oft-overlooked, magically musical monolith that stands majestically between Arlington Cemetery and the Iwo Jima Memorial.

One of the oldest Catholic churches in the U.S., situated just east of Gettysburg.

These small house replicas have stood proudly since the 1950s, even as the property has changed hands.

An outlandish shoe shaped house built by an eccentric millionaire.

An industrial waste tourist attraction.

These unique rock formations were created during the Ice Age.

North America’s largest collection of horological devices and home to a colossal clock with a dizzying array of features.

In the bowels of a 19th-century brewery lurks a fine-dining restaurant offering an array of themed feasts.

One of the few remaining covered bridges in Lancaster County.

Don't get it twisted: This is the oldest pretzel bakery in the United States.

What looks like a simple quaint estate in rural Pennsylvania was in the 18th century home to a small monastic community.

The first of Lancaster's "rural cemeteries."

This iconic Lancaster everyman has been reading the same story since 1980.

The home of possibly the least-loved U.S. president stands as a sort of unpopular Monticello.

In this cemetery stands the country's first public crematorium.

The slate extracted from these Pennsylvania quarries was once hailed as the finest in the world.

Although built to generate electricity for Marylanders, this dam has become an all-you-can-eat buffet for American bald eagles.

Slated for demolition, this house was relocated piece by piece.

Over 20,000 sets of spice shakers reveal the surprisingly telling history of our most basic spices.

A Circus legend leaves an unexpected endowment.

A lone gunner's station is all that remains of a replica Spanish Fort in Florida.

The giant squid's 27-foot-long corpse lies preserved within a Sarasota aquarium.