[Atlas Sneezed]

These, I have seen. I consider Chichen Itza to be most "wondrous", even though it is awfully primitive compared to what was being done in Europe at the time.

2 Alhambra, Granada, Spain
4 Chichen Itza Aztec site, Yucatan, Mexico
5 Christ the Redeemer, Rio de Janeiro, Brazil
6 Colosseum, Rome
8 Eiffel Tower, Paris
14 Neuschwanstein Castle, Fussen, Germany
17 Statue of Liberty, New York

Where are the friggin' cathedrals?! St. Peters, for one, maybe the one in Toledo (Spain). La Sagrada Familia in Barcelona. The stained glass at Saint Chappelle in Paris is wondrous. The cathedral in a mosque in Cordoba in incredible.

And if you want to include modern wonders like the Sydney Opera House, I'd add the VLA Building on Cape Canaveral, as well as the Panama Canal. I'm also a big fan of the Guggenheim Museum in Bilbao Spain

The following I intend to see in the next 5-10 years:
1 Acropolis, Athens, Greece
3 Angkor Wat temple, Cambodia
7 Easter Island Statues, Chile
9 Great Wall, China
10 Hagia Sophia church, Istanbul, Turkey
13 Machu Picchu, Peru
15 Petra ancient city, Jordan
16 Pyramids of Giza, Egypt
18 Stonehenge, Amesbury, United Kingdom
19 Sydney Opera House, Australia
20 Taj Mahal, Agra, India

[nofaceveils]

We visited Stonehenge last year. It was OK, but it's right next to a highway and the grounds are surrounded by ugly plastic fences to keep non-paying punters out. You access the site itself via an ugly 1960s-era tunnel and the atmosphere is sort of ruined by constant car and air traffic and tourists chattering away in a zillion languages, and getting in between you and Stonehenge to take photos of it from every concievable angle.

It also takes forever to get to, and there's not much else in that part of Wiltshire. ;-) Worth a trek out if you MUST see it, though.