Palace of Versailles

The pinnacle of absolute monarchy and the indulgence of the ancien régime in France, Louis XIV transformed this former hunting lodge into one of the most expansive palaces in the world. So indulgent was it, in fact, that Louis had all records of how much it originally cost to build destroyed, though the estimates range from $2 billion up to almost $300 billion in today's dollars.

 Sistine Chapel

Honestly, with some of the most prominent works by some of the most famous Renaissance artists--like Michelangelo, Sandro Botticelli, and Pietro Perugino--how could you not want to take a quick look at the Sistine Chapel? I mean, it's in Vatican City, which is pretty worth checking out on its own.

Plitvice

Plitvice is the oldest national park in Southeast Europe, and the largest in Croatia. Its views are something that few would expect in Europe at all, and the fact that it remains relatively untouched (aside from a few walkways), makes it all the better.

Petra

Built around 1200BC, Petra is an ancient city of Jordan, renowned not just for the fact that it's entirely built inside "towering rocks," but for its intricacies therein. The city was able to constructed in the desert because its designers, the Nabataeans, redirected waterways, creating an artificial oasis--the center of their caravan trade, and a fortress.

 Bora Bora

Located in French Polynesia in the South Pacific, Bora Bora is well-known as one of the most beautiful islands in the world. With crystal clear waters and awesome accommodations, there's no way to avoid this one.

Victoria Falls

Victoria Falls, between Zambia and Zimbabwe, is (debatably) the largest waterfall in the world, with a width of 5604ft (1708m) and a height of 354ft (108m), and a much better choice than Niagara Falls.