Once a famously inexpensive destination, Prague is no longer cheap; there's not much on offer without a price attached. Parks and gardens, some museums and galleries, and gazing at the glorious architecture are all free, as is the street entertainment on Charles Bridge.
Prague Without a Ticket
Without having to buy a ticket, you can wander through the courtyards and gardens of Prague Castle, watch the changing of the guard ceremony and visit the western end of the nave of St Vitus Cathedral. Nearby Charles Bridge, with its array of jazz bands, buskers, caricature artists and postcard sellers, is a smorgasbord of free entertainment.
Over in Old Town Square, the hourly performance by the Astronomical Clock is a classic tick without a ticket, as is the baroque glory of the nearby Church of St Nicholas. Although you'll have to pay for a guided tour of the Municipal House, you can wander through the glorious art-nouveau cafe, the lobby and to the downstairs American Bar without paying for admission.
Free Museums & Galleries
A number of outfits, including the recommended Prague Extravaganza (www.extravaganzafreetour.com), offer guided walking tours 'for free' (ie on a no-fee, tips-only basis). The guides are local volunteers, and tours depart twice daily from outside the Cartier store on the corner of the Old Town Square and Pařížská. See also Royal Walk Free Tour.