The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

Thanks to a quirk of elevation this gift shop produces magic doughnuts that are found nowhere else on Earth.

The only subway station in the city that still makes use of gap fillers.

Red Hook's massive public pool, built by Robert Moses.

One of the most dazzling dioramas at the American Museum of Natural History is also one of the oldest.

Once called Winthrop Park in 1889, home to a decidedly sexy tribute to the Monitor vs. Merrimac battle.

Cooks at this tiny takeout spot grind their rice flour in a stone mill each morning for perfect cheung fun.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

America's oldest Eastern European synagogue provided the immigrants of crowded Lower East Side tenements a space of sanctuary.

A desiccated merman and a walrus penis bone are among the oddities in this eclectic collection of shipwreck treasures.

Eat like pre-Columbian Native Americans in this New Mexico restaurant within the Indian Pueblo Cultural Center.

This recreation of a 19th-century dime museum is full of oddities.

Intricate, eye-catching, award-winning rubber sculptures liven up this Pennsylvania town.

These ruins of an octagonal stone school that was later used as an A.U.M.P. church exemplify a popular school design from the 1830s.

A wonderous place devoted to art and metal.

This quarter-mile tunnel under the Bluff in Pittsburgh bends at a 45-degree angle.

An ode to filmmaker George A. Romero, who used the mall to film an iconic horror movie.

Descendants of this colonial Pennsylvania family still travel from far and wide to visit the 300-year-old home of their Quaker ancestors.

The legacy of baseball great Roberto Clemente is preserved in a retired Pittsburgh fire station.

This jail which was in service for over a century is now open for curious visitors.

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

World's first "penitentiary," meant to be humane, drove men insane.

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.