In its day this historic fort held 100 cannons pointed in almost every direction to protect New York.

A curious fountain that has no water and includes Satan, a crab, and 9 giraffes.

Once America's longest-manned military fort, now an abandoned hulk.

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

Mysterious 500-year-old tapestries depict a unicorn hunt.

Sniff the Titan Arum's rotting flesh.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

A miniature rainforest is growing inside of a Midtown Manhattan office building.

Try not to get slimed in Tribeca.

Once the site of a Native American harvest festival, this humble clearing later played an invaluable role in the birth of jazz.

Before becoming a public park, this spot was a shell midden, a fort, and an amusement park.

The stone labyrinth in this New Orleans city park was laid to symbolize healing in the wake of Hurricane Katrina.

Formerly known as National D-Day Museum, this collection commemorates the battles of Normandy and WWII.

This "second" cemetery represents New Orleans' attempt to keep cholera at bay.

Once defending the city of New Orleans from invasion by sea, this fort faces an uncertain future.

This macabre shop, filled with art, oddities, and taxidermy is hidden in the heart of the French Quarter.

The oldest family-run restaurant in the United States is a living museum of New Orleans dining history.

This bar named after the world's first mixed cocktail was home to one of New Orleans' most notorious politicians.

This historic "City of the Dead" lies prominently in the center of New Orleans' famous Garden District.

A coal fire has been burning underground here since 1896.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

An ancient Egyptian temple in the middle of Madrid, Spain.

Limestone caves with spectacular showcase chambers.