Here, five art-rich cities where passes are worth their price.
Paris Museum Pass provides access to the Louvre as well as over 60 museums in Paris and the Île-de-France.
Cost: $37 for two days; $56 for four days; $74 for six days. Sold at the Tourist Office in the Carroussel du Louvre, in major Métro stations, FNAC stores, and participating museums and monuments.
With the I Amsterdam Card, you can visit most museums, including the Rembrandt House, the Rijksmuseum, and the Van Gogh Museum, as well as have unlimited use of public transportation.
Cost: $38 for one day; $50 for two days; $62 for three days. Sold at every tourist office.
www.amsterdam.info/pass/ and www.iamsterdamcard.com
The Madrid Card covers entry into some 40 museums: Prado, Thyssen-Bornemisza, Reina Sofia, among others.
Cost: $44 for one day; $57 for two days; $69 for three days.
London Pass not only grants access to 50 historic buildings and cathedrals, galleries, museums, and the Damian Hirst-decorated Tate Boat, but it also allows you to skip to the front of the line.
Cost: $52 for one day; $93, three days; $128 for six days.
The Lisboa Card gets you free admission to 25 museums, such as the National Ancient Art Museum, and historic buildings, plus 52 discounted tickets for other city sites. It also provides free and unlimited travel on the Underground, buses, and trams.
Cost: $17 for a 24 hour pass.