is in the history-making business. ♪ o say can you see >> reporter: the united states was created 240 years ago in american firsts that happened here is indeed a long one. philly was the site of the first u.s. kpol and home to the first u.s. congress, u.s. mint, stock exchange, hospital, art museum, ae church. the site of the very first thanksgiving day parade. but wait, there's more. you guys recognized this place? and let's go. ♪ >> whoa, whoa, what's with the music? ♪ >> guys? quit it with the rocky theme. i'm actually trying to get into the building at the top of the steps. ♪ >> reporter: because the philadelphia museum of art boasts one of the world's greatest collections. monette. van gogh. saison. >> want to see something that will really make your head spin? look no farther than the museum of medical history. the jaw-dropping array of bodily specimens includes the -- well, the jawbone tumor of president rover cleveland. they say the city of brotherly love has a big heart and you can walk right through that heart here at franklin institute. >> oh, hey, mo. you know, this heart is the size of the heart that would be found in a person 220 feet tall. >> well, thank you for that scientist derek pits of the franklin institute.