No Man's Fort

Here, we seek our make-believe underground top-secret fantasies. No Man’s Fort, a circular Victorian-era structure surrounded by water, can make you feel like you’re allowed access to a hidden vault. Inside, however, it’s a luxe hotel with 22 bedrooms, a lighthouse penthouse suite, a nightclub, an open-air hot tub, and a laser quest arena.7. Aydinli Cave Hotel, Turkey