The Mansion at O Street

This quirky, description-defying museum tucked into a residential area of Dupont Circle features over 100 themed rooms, maze-like passageways, hidden doors and secret rooms. Chock full of furnishings, art, books, knick-knacks and unique decor, the museum also operates as a type of consignment shop, where everything is for sale (aside from the impressive collection of guitars). The rooms are fascinating in their location and theme, from a two-story log cabin room, a safari room, an art-deco penthouse and a John Lennon-themed room (yes, he stayed here!). You'll spend hours here, and each time you visit you'll find something new.