The oldest house in Manhattan is now a museum that remembers the home's sordid history of scandals, vice-presidents, and ghosts.

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

From scholastic to sepulchral - now under reconstruction.

Walking around West Harlem reveals a scavenger hunt of beautiful bird murals.

A Manhattan Episcopal church with an eerie underground crypt.

You must take the A train... to the last active cemetery in Manhattan.

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

In 1986, Keith Haring was arrested for painting this anti-drug mural on a Harlem handball court.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

This was once the home of Gahan's Saloon, Denver's most storied speakeasy.

One of three remaining theatres in the United States created in the Art Deco Mayan Revival style.

Once a mortuary that held the remains of Buffalo Bill, this Denver hotspot is now a death-fixated restaurant.

A mural and a few historical markers commemorate Denver's once-thriving Chinatown, which was obliterated in a racist riot.

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

This mural painted by Keith Haring was done without payment as a gift to entertain the children at the Hôpital Necker.

The Sun King's military models, saved from the Louvre.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

This modest marker near Notre Dame identifies the very center of Paris.

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the 20th century.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.

This innocuous-seeming building is actually the remnant of a major wartime brothel.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.