City law dictates that this mountaintop cathedral containing the heart of a saint is to remain the tallest building in town.

The last remaining predreadnought battleship in the world has been a museum for nearly a century.

It is said that coins washed in the waters here will miraculously multiply.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

An astounding collection of medical specimens, including bits of President Lincoln.

The United States Capitol's former columns still stand.

The country's oldest continually-operated mini golf course lies hidden in plain sight, eclipsed by one of D.C.'s most popular tourist attractions.

This unique museum cafeteria showcases the history and regional diversity of African American cuisine.

An overlooked memorial honoring the local Washington residents who died in World War I.

A gorgeous mural outside a beloved D.C. restaurant pays homage to famous Black Americans.

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.

These unusual rooms on wheels are holdovers from the 1960s.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

Why settle for barbecue chips when you can get actual barbecue?

Frozen in Norway, vended in Singapore.

There aren't too many operational funiculars around, but Pittsburgh has two!

On any given day this sprawling market houses literally tons of government-regulated gold, gems, and precious metals.

Skyscraper powered by wind turbines attached between its towers.

This beautifully historic Bahrain fortress might not be the most popular attraction around, but that might make it all the better.

A grand New York post office that is home to mailman Santas, scraps of postal history, and a pneumatic mail system.

Red frames showcase remnants of one of New York's original subway stations.

Pulled from the rubble of one of the worst modern tragedies, a steel crossbeam became a symbol of hope for New Yorkers.

The home of the first American-born saint is one of the only curved buildings in New York.