This 19th-century sugarcane plantation is one of the most well-preserved estates of its kind, including its original quarters for enslaved laborers.

The first plantation museum in the United States to focus on the lives of enslaved people.

Mexico's astounding mummy museum with "the world's smallest mummy."

An elaborate Mayan city shrouded in alien conspiracy revealed the tomb of Pacal the Great.

High atop a Mexican rainforest mountain, this ancient pyramid once drew pilgrims countries away.

Twelve natural mummies are displayed in the crypt of this former monastery school.

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

Government testing at the asylum briefly explored using marijuana as a "truth serum" on Nazi prisoners of war.

The morbid items in this small and hidden museum are not for the weak stomached.

Abandoned for decades, trains still pass through the now-restored remains of one of Madrid's first metro stations.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

This World War II bunker now survives as a documentation of the Nazi regime and war crimes.

A state-of-the-art medical facility from the Imperial era is now a derelict ruin.

This allegedly haunted 16th-century tower house-turned-museum exhibits thousands of spectacular objects.

Long abandoned underground complex to keep royals safe from a nuclear war that never came.

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

English antique dealers with a taste for the unusual.

The final resting place to 300 Victorian-era pets hides inside the city park.

The history of radiation is on safe display at the foot of a radiation science laboratory.

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

This South London cemetery holds the remains of more than 15,000 people.

This fascinating museum in an old water tower holds the world's largest collection of Vodou artifacts from western and central Africa.

This trail leads to a mine that was used as a sanctuary during the Great Fire of 1910.

It was once used as a classroom to teach mining skills to local high school students.