Teheranno boulevard is one of the famous roads in Seoul
Teheranno 테헤란로 is a huge boulevard connecting Seocho with Gangnam, two of the new trendy districts of Seoul. You have all kinds of awesome modern buildings located on this road. Many internet companies are located here, like Naver, Daum and Yahoo! The road is named after Iran's capital city Tehran (source). One of the famous buildings here is the Samsung Town (the photo below). I didn't walk along this road, I chose Gangnamdaero instead.