Nagcarlan Underground Cemetery is located at Nagcarlan, Laguna, Philippines.

Built in the 18th century by the Franciscan Missionaries, the Underground Cemetery is enclosed by a circular structure. The intricately designed wall and wrought iron gate with a red-tiled walk leads straight to the small chapel, where an altar-like structure is located. The tombstones are embedded on the brick walls of the cemetery and the basement. At the crypt of the cemetery, according to history, is where the local Katipuneros, or followers of the secret revolutionary societies collectively called the Katipunan, plotted against Spanish rule.

Source:

Tourism.gov.ph