A half-size replica of the World Trade Center towers above Tulsa.

The fifth tallest statue in the United States is a shirtless monument to the oil worker.

These massive mitts are made of 30 tons of devotional bronze.

An acoustic anomaly with a mysterious cause sits in the heart of Tulsa.

This former mining town was named the most toxic town in America.

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

This ruined fort hidden at the top of Central Park can't seem to keep from losing its historical plaques.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

This historic church with a connection to "Uncle Sam" is now a fraternity house.

This stained glass window designed by Tiffany Studios is hidden behind the circulation desk of a public library.

This Fifth Avenue church has long been the favored worshiping place of Broadway actors and vaudeville performers.

Though its celestial ceiling is impressive, the true star is the vast collection of French books.

G.V. Black, the Father of Modern Dentistry, keeps an eternal eye on Chicagoan’s teeth from his perch in Lincoln Park.

All of Chicago's wood-paved streets are long gone but two alleys remain.

A monument to the art of slicing people open.

Grab a slice of pizza next to the remains of the "human monkey" who ran for mayor.

This railroad and oil tycoon's lavish estate now stands as a time capsule of the Gilded Age.

A replica of a 7th-century church hides in plain sight in the middle of the concrete jungle.

Cheap pizza and all of your naughty bedroom needs housed in a stunning example of Art Nouveau architecture.

The only intersection in America where the buildings on all four corners were built pre-Revolutionary War.

This was one of the first (and last) university-built and operated nuclear reactors.

A bygone village occupation lives on via this quaint public chalkboard.

This historic folk museum celebrates the attention to detail that makes America great.

This hidden oasis features a stunning view of the Hudson River and the Palisades from a castle-like museum.