Dooley Vacations An offshoot of Dooley Car Rentals. First night is prebooked. Also Great Britain and France. 877/331-9301, dooleyvacations.com.
EuropeASAP You won't know the airline or the exact departure date until after you book (enter two possible dates and you're guaranteed to get one). Also Great Britain and France. 415/750-5449, europeasap.com.
Ireland.com Ireland packages only. Unless you request otherwise, your first night is prebooked in a hotel near the airport. 800/896-4600, ireland.com/travel.
Sceptre Tours Ireland only. First night is prebooked unless you request otherwise. 800/221-0924, sceptretours.com.
These places have been inspiring more than just vacation ideas for centuries. Long revered for their gorgeous scenery and spiritual power, here are ten natural wonders—from a ceremonial Mayan lake to the home of Shiva—that are the stuff of legend.