A small graveyard is hidden in the midst of a bustling university campus.

An unassuming stone building houses New York City's oldest seismic station almost 30 feet below the Bronx.

The famous author's cottage hideaway.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

Every equinox this Maya pyramid puts on a spooky ancient light show.

The "Seinfeld" diner.

Even for Egyptian royalty, the afterlife was bring-your-own-beef.

The flagship building of an early national restaurant chain is a superb example of terra cotta art.

This outdoor gallery of graffiti-covered walls pays homage to the past, present, and possible future of street art.

One of the most enjoyable bits of history at Coney Island and “the most romantic ride in the world.”

New York's southernmost subway station is whimsically wavy.

These small stands sell Malian snacks to worshippers and passersby after Friday prayers in Harlem.

The legendary court where emerging basketball players gain their street cred.

A luxury hotel constructed out of a former jail.

The painter who popularized "bulls" and "bears" as symbols for the stock market didn't get a proper headstone for over a century.

An art installation commemorates journalist Nellie Bly's undercover reporting inside a New York asylum.

One of the last functioning antique elevators in Chicago.

Where Cusack's record store from the film "High Fidelity" was located.

A military museum and library dedicated to the citizen soldier.

This historic hotel invented the chocolate brownie.

An actual 1957 Cadillac De Ville, encased in 15 cubic yards of concrete.

An outdoor urban gallery of large-scale artworks by the world's most influential street artists.

The last masonry skyscraper ever built reveals a transitional moment in architectural history.