Big Ben
-the clock in the tower in the parliament
Canary Whart
-modern business and shopping development near the river Thames
City hall
-modern circular glass building for the Mayor and local goverment
St Paul's Cathedral
-a large church built in 1673
The Gherkin
-oval shaped, glass office block
Tower Bridge
-famous bridge across the Thames which opens to let ships pass
Those place are interesting! I'll have a look at there if I got the chances. =)