This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

Robots, lasers, and whoopee cushions, oh my!

The remains of a religious colony, its amusement park, zoo, and baseball empire.

This museum remembers an apocalyptic cult that became more famous for baseball than religious radicalism.

A lush green oasis in the middle of Chicago.

Cemetery featuring rare glass-fronted columbarium.

Chicago's North Park Village was once the largest municipal sanatorium in the country.

This botanical garden outside Chicago boasts an array of more than 300 varieties of lilacs.

World's second largest particle accelerator, where nature reveals its secrets.

A tribute to the twin ideals of religion and patriotism, built by a Catholic priest from rocks, glass, and innumerable found items.

A bronze plaque marks the site of the only show the "King of the Soul Singers" ever missed.

Northern Ireland's Brobdingnagian stepping stones.

Try not to get slimed in Tribeca.

Mysterious rocks that ring musically when struck.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

A trash dump made beautiful by nature's power.

A massive underwater sinkhole made famous by Jacques Cousteau.

A toxic ghost town sitting atop a massive coal fire.

A lovers' beach, tucked below the surface of the island, provides a safe haven for romance.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

A restaurant and lodge in northern Wisconsin which served as a clandestine hideout for John Dillinger and featured one of the most famous botched FBI raids in history.

This freshwater spring fills with 10,000 gallons of water per minute.