It's free! :) (needs security check). Beautiful ar...

It's free! :) (needs security check). Beautiful architecture, souvenir shop, small museum (about maybe civil rights) and several exhibitions. It can held events like wedding party in a hall inside.We also can see the chambers
There is a security check, but you can enter for free! It is possible to visit (safe) while walking around the city from COSI (Science Museum). Inside is a gorgeous architecture (also outside), art, event halls, historical exhibitions, souvenir shops and restaurants. You can also see the chamber (if the curtain is open)