Gang fights don't just happen on the streets, they happen under them too.

Historical figures from New York City's Catholic community reside in Midtown.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

Deep under Manhattan is the largest construction project in city history. So far, the project has taken the lives of 23 workers, or "a man a mile."

Just your average Marie Antoinette–themed speakeasy in an abandoned 19th-century subway tunnel.

Reportedly 1,400 years old, this may be the first of the Fiji Mermaids.

Modern Japanese museum is buried by snow annually.

Each year this Japanese temple overflows with scowling, bearded good luck talismans.

This 24-hour vending machine serves up homemade treats inspired by the local Japanese snow monkeys.

Home to what locals claim is the largest whale skeleton in Southeast Asia, which is worshiped yearly.

Located off a bustling strip, a silent teahouse employs workers with hearing- or speech-related disabilities.

Drink and learn at this striking ode to coffee culture and history.

The subtle science of a master molecular gastronomist.

Rock-cut cave complex filled with ancient Buddhist artwork.

This aromatherapy shop and mini-museum cofounded by the Sigur Rós frontman documents Icelandic history through scents.

The only gallery in New York dedicated to olfactory art and the exploration of scent in art.

A boutique perfumery fashioned to look like a Victorian-era shop.

Perfume museum and library.

This domed temple was built in a hidden cave mouth as a refuge for sinners seeking absolution.

The only urban monument in the world designed by the great surrealist painter Salvador Dalí.

Giant eggs, walls of bread, and nightmare surreality mark the largest collection of works by Salvador Dalí.

This dreamlike museum is filled with the works of an influential surrealist artist whose name you may have never heard.

A fabulously bizarre surrealist sculpture by the late artist Leonora Carrington.