The Victorian-era greenhouse is stuffed with tropical plants, and open 365 days a year.

The Incredible Hulk, Yoda, Mulder and Scully, and many many others watch over the mean streets of Toronto.

A botanically themed auditorium blooms within the world’s last operating double-decker theater.

A collection of human remains, animal body parts, and other macabre curiosities all legally for sale.

This 1967 experiment in modular architecture was designed to be a new model for urban living.

Resting place of Hollywood's immortals is also site of summer film screenings.

Crypt mausoleum in cathedral's basement contains relics of third century Roman martyr, Saint Vibiana.

One of the last Jazz Age "Wonder Theaters" in New York City.

The oldest surviving synagogue in New York City is now a soaring art space.

The name of this famed hospital was once a byword for the horrors of medical and psychiatric care.

A historic 1890s architectural masterpiece with an iconic clock tower that, once open to the public, now faces an uncertain future.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

A grove of colossal man-made flowers built to collect the sun's rays.

Scale replica of China's ancient terracotta tomb warriors and Forbidden City are the side project of an eccentric millionaire.

An abandoned quicksilver mining town surrounded by the Big Bend parks.

A hand-built folk art installation covered with messages of God's love.

Site of a former hidden treehouse in New Orleans.