March yourself to Bangladesh Navy Headquarter, explore the site and try to understand what being a member of the military feels like.
You'll soon discover why this Dhaka military installation is popular with travelers. If you're looking for other things to keep you busy, Saat Masjid, Dhakeshwari Temple, and Curzon Hall are in the area as well. They won't take you very long to reach from Bangladesh Navy Headquarter.