The Colonial mansion has been turned into a museum which holds jewellery and historical artefacts. The surroundings are nice, too.
Official website http://www.museuscastromaya.com.br/acude.htm
Email acude@museuscastromaya.com.br
Phone +55 21 3433 4990
Address Estrada do Açude 764, Alto da Boa Vista, Rio de Janeiro, Brazil
Coordinates -22°57'48.965" N -43°16'58.318" E