Căldărușani Monastery lies 30 km. from Bucharest to the North-East, on the shore of the homonymous lake. The monastery lies in an 125 Hectare natural reserve which includes many different trees and forest flowers. It was built in 1637-1638 (in 100 days sharp) by Matei Basarab on the spot of a former convent.

http://www.bucharestian.com/Out_of_City/Entries/2010/1/11_The_Artistic_-_Caldarusani_Monastery.html