The suspension bridge spanning the Kallada River in Punalur is the only one of its kind in south India and it is 400 ft. long. As this bridge erected in 1877 is found to be not strong enough to cope with the mounting flow of pasenger and goods traffic, a new concrete bridge is constructed near by. The Suspension Bridge is now of archaeological interest only. Its construction was commenced in 1871-72 and completed in 1877-78 AD. The work was supervised by Henry from Scotland.

Thenmala is a very popular tourist place near Punalur in Kollam district. India's first eco tourism project is located at Thenmala. Thenmala is located about 72 kms from Thiruvananthapuram. This is a predominantly forest area in the Western Ghats. Shenduruney Wildlife Sanctuary is one of the major attractions of this place. Other places of tourist importance are Thenmala Dam, Palaruvi, the adventure zones etc. Palaruvi Waterfalls is only 16km from Thenmala. The main attraction is a 300 foot-high waterfall which looks like a Stream of milk and hence the name Palaruvi.