This deal has expired, but be sure to check out our Top 25 deals of the week for savings on trips to destinations around the globe.

Prague's newest hotel/hostel opened for business today. The 94-room, smartly designed Mosaic House offers "green"-minded travelers an eco- and cost-friendly option in the heart of the Nové M?sto (New Town) area, just steps from the famous Charles Bridge. Built in 1935, the revamped structure was outfitted with energy-efficient lighting, low-flow toilets, automatic room temperature controls based on the number of people in the room, and the Czech Republic's first gray water recycling unit (meaning shower water is filtered for reuse). Even the oil used to fry up  hamburgers at its restaurant serves an exalted eco-purpose: it fuels the property's airport shuttle busses! Doubles start at around $50.

For more trip-planning information, visit our Prague Travel Guide.