The only Civil War battle in Washington D.C. took place near this highest natural point in the city.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

These towering spires and glowing walls are carefully crafted from hundreds of thousands of icicles.

The only building in Louisville (hopefully) that contains two ancient holy skeletons.

A humble plaque marks the site where the country music legend was found dead in his Cadillac.

The surprising home of the iconic Santa Monica Pier Ferris Wheel.

This small Arkansas town once had a close encounter with the Beatles, and are determined never to let anyone forget that. Ever.

Though the original building has been demolished, these massive bronze doors were saved.

An iconic location along the Los Angeles River where countless movie scenes are filmed.

Formerly Fire Station No. 27, the museum is a hidden gem in the heart of Hollywood.

The blinking light atop the iconic landmark has been sending secret messages for decades.

Historic funicular railway, believed to be the shortest railroad in the world.

The history of the tea trade is told in bas-relief on this historic pair of Boston doors.

Ice cream stand, snack bar, and time capsule of milk conveyance.

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

The former sign of this immortal music venue is just that--undying.

This nearly invisible wire transforms much of the city into one big, symbolic home on the holy day.

New York's unstoppable progress turned this cemetery into the smallest burial ground in the city.

Monument to a forgotten NYC disaster that claimed the lives of 1,000.

Historical figures from New York City's Catholic community reside in Midtown.

Revolutionary War casualties fill the only 17th century structure remaining in Manhattan.

A crumbling staircase in upper Manhattan is all that remains of one of the most important sites in sports history.

A famous songsmith's custom piano, dubbed "High Society," is hidden just out of sight in one of New York's finest hotels.

Harlem park dedicated to compulsive hoarders killed by their own junk.