Porto Montenegro, the Balkan Riviera

The black-and-white-tiled infinity pool at Porto Montenegro stretches 213 feet and features panoramic views of the Bay of Kotor. It's believed to be the longest infinity pool in the five-year history of the Republic of Montenegro, and a construction crew is currently at work on a surrounding teak deck, rows of cabanas, and a DJ platform. On the opposite shore is a cluster of squat gray houses where Yugoslav Army officers once vacationed.

The pool, now empty, is expected to be filled by July. That's when British ex-hedge-fund manager and Rothschild scion Nathaniel Rothschild will celebrate his 40th birthday with 400 of his closest friends. According to Colin Kingsmill, Porto Montenegro's sales and marketing director, Rothschild's guests will include the ritziest, wealthiest, and most photogenic people on earth. Kingsmill won't say who's coming, exactly, but he claims the "least interesting" person on the invite list is Tony Blair.