Initially it was planned to spend about 4 days to explore NYC. My friend Igor convinced us to visit Philadelphia to avoid huge crowds in NYC which are normally there during Saturdays. It was just 50 miles from the place we were living, therefore we decided to try. Why not? :)
Part of the buildings in Philadelphia was built in 60s and 70s and it looks quite scary (maybe back in old time it looked cool). Though now it looks more like concentration camp. On the right - Philadelphia Mint opened in 1969. It's one of the two places in USA where people produce coins. (:
From the left side you can find the famous steps from "Rocky" movie. This is exactly the place he was standing with his hands up. You can even find there his foot prints there (though it was placed there after releasing Rocky-3).
Though the city os also famous as a place where the first USA flag was created. Betsy Ross did it in 1776. Back in that time there was only 13 stars on the flag, as there were just 13 states in USA.
Another notable monument is The Liberty Bell which is an iconic symbol of American independence. Its ring called the citizens to the reading of the Declaration of Independence which took place at July 8, 1776. In 1837 it became the symbol of abolitionists movement and got its name. It's a bit smaller than Tsar-bell in Moscow, though also is not able to ring anymore due to huge crack (which was enlarged during the latest attempt to fix it about 150 years ago).
Also there are too many wide rivers and giant bridges over it.