How to Travel:
3 daily flights of Malaysia Airlines, 2 Daily flights of Biman Bangladesh Airlines and Malindo Air (Budget carrier), 1 Daily flight by Air Asia (Budget carrier too) are operated to take passengers from Dhaka to Kuala Lumpur, Malaysia.
Then from KLIA (KL Int'l Airport) one can take the KLIA Ekspress train to KL Sentral. Then ride of LRT (Yellow line in the the city metro rail map) from KL Sentral to Masjid Jamek Station. Then 10 minutes walk will take to reach Mardeka Square which is surrounded by UNESCO heritage buildings of Sultan Abdul Salam.
Most commonly tourists from Bangladesh prefer to stay in Bukit Bintang area of KL. Those staying in Bukit BIntang will need to take the monorail to KL Sentral station from Bukit Bintang station. Then again LRT to Masjid Jamek station.
My suggestion for people planning to visit KL, please do not ride Taxi there. Most of the taxi drivers I faced are quite rude in attitude and may cause you troubles which you would always prefer to avoid. Best public transportation in KL is the Metro rail. There are four different rail links (MRT, LRT, Monorail and KTM Kommuter) that all come to KL Sental and can easily take you to any destination within the city of KL.
Happy travelling. :)