Few people realize that the world famous temple Wat Pho predates Bangkok. When King Rama I moved the capital city across the river from Thonburi to its present location on the north bank, he built his palace next to Wat Photharam. Now universally known as Wat Pho, the temple houses the Reclining Buddha and hundreds of other Buddha statues brought from across Thailand by King Rama III.
If you are jet-lagged Wat Pho makes a good early morning expedition. Get there at 8am to appreciate the vastness of the temple before the sun and the crowds get too strong. About twenty-five minutes door to door via river taxi from Saphan Taksin BTS station.