Welcome to the castle of kink—literally. This 20,000-square-foot palace houses the studios of Kink.com, a porn production company specializing in BDSM and bondage videos. The building, originally built in 1914, was formerly home to the National Guard; now porn actors and voyeurs roam its cavernous halls. Tours happen every day (consult the website for times), during which you'll be led through various sets by a guide who may or not be a Kink.com “model.” Most of the filming happens in the basement, where you might encounter a human-sized cage or dungeon-like set. Expect to see a proportionate number of whips, chains and kinky sex toys. Tours conclude in the velvet-walled, Victorian-style salon on the fourth floor, which is suggestively furnished with X-rated art.