An old railway coach used by Cuban presidents. You can go in and see how the powerful used to travel.
9:30 am - 5:30pm Tues-Sat; 9:30 am - 1pm Sun
Free
More info http://www.lahabana.com/guide/coche-mambi/
Address Coche Mambí, Churruca, Havana 10100, Cuba
Coordinates 23°8'10.433" N -82°20'54.477" E