Thanjavur Maratha Palace – Underground Tunnel
There are two underground passages in the palace, only one of them is partially accessible by tourists. This is a relatively short passage and the Government is renovating it as of 2014. Another secret tunnel which is a mile long connects the Brihadeeswarar temple and the palace. It is wide enough to ride 2 horses in parallel, and was designed as a getaway route by Kings during war times.