At Trincomalee you find the Sacred Hill of the Three Temples.
Tricomalee is located on the East (North/East) cost of Sri Lanka. (Tamil speaking area.)
Trincomalee is known from the Travels of Marco Polo. It became an important destination for East Asian and Chinese sea traders at one point in history. Later foreign powers like the Dutch, French, English and Portuguese have fought for the mastery of this harbor. Today Trincomalee is home for an Air Force base and naval bases of Sri Lanka.
The Pigeon Islands and hot springs located in Kanniya are important tourist attractions, also the Koneswaram Rock Temple, Thirukonesvaram Kovil, Fort Fredrick and World War II cemetery.
Tricomalee is also know as the place to see whales. (Autum / Approx September), surfing, fishing and diving.
You can read more about Trincomalee here