The Grand Palace
The Grand Palace (Phra Borom Maha Ratcha Wang ) is a complex of buildings in Bangkok, Thailand. It served as the official residence of the king of Thailand from the 18th century to the mid-20th century. After the death of King Ananda Mahidol in the Baromphiman Palace, King Bhumibol moved the official royal residence to Chitralada Palace. Construction of the palace complex began in 1782, during the reign of Rama I
. 
The palace complex sits on the east bank of the Chao Phraya River. The other approaches to the palace are protected by a defensive wall of 1,900 metres in length, which encloses an area of 218,400 square metres. Further out from the wall is a canal, which was also created for defensive purposes, making the area surrounding the palace an island, known as Rattana Kosin.
Prominent parts of the Grand Palace:
- Wat Phra Kaew, the temple containing the Emerald Buddha
- Chakri Mahaprasad Hall, a building in a style influenced by the Italian Renaissance
The Wat Phra Kaew (Temple of the Emerald Buddha; full official name Wat Phra Sri Rattana Satsadaram) is regarded as the most sacred Buddhist temple in Thailand. It is located in the historic center of Bangkok, within the grounds of the Grand Palace.
Despite the hot weather most of the year in Bangkok, long trousers are required to enter the wat. This rule is strictly enforced. The facility can offer the rental of proper trouser wear.
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Wat Pho
Wat Pho is the one of the largest and oldest temple in Bangkok (with an area of 50 rai, 80,000 square metres), and is home to more than one thousand Buddha images, as well as one of the largest single Buddha images: the Reclining Buddha (Phra Buddhasaiyas). Made as part of Rama III's restoration, the Reclining Buddha is forty-six metres long and fifteen metres high, decorated with gold plating on his body and mother of pearl on his eyes and the soles of his feet. The latter display 108 auspicious scenes in Chinese and Indian styles.
The Wat Pho complex consists of two walled compounds bisected by Soi Chetuphon running east-west. The northern walled compound is where the reclining Buddha and massage school are found. The southern walled compound, Tukgawee , is a working Buddhist monastery with monks in residence and a school.
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Sanam Luang
Sanam Luang is an open field in front of Wat Phra Kaew and the Grand Palace. Sanam Luang is located in the Phra Nakhon district, the historic center of Bangkok.
It was written in the Royal Chronicle as follow that : "In front of Wat Mahathat, Sanam Luang lies between the Royal Palace and the Palace to the Front. When royal cremation was held at the Phramen Ground, the pyre set up in the centre with the Royal Palace Pavilion to the south and the one of the Prince of the Palace to the Front to the north. The music from the Royal Palace and from the Palace to the Front would be played on opposite sides of Sanam Luang".
Sanam Luang was officially known as Thung Phra Mane (the royal cremation ground). It has been used as a site for the cremation of kings, queens and high-ranking princes since the reign of King Rama I.
In 1855, King Rama IV changed the name from Thung Phra Mane to Thong Sanam Luang , but the name is now shortened to Sanam Luang.
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Democracy Monument
The Democracy Monument (Anusawari Prachathipatai ) is a public monument in the centre of Bangkok. It occupies a traffic circle on the wide east-west boulevard Thanon Ratchadamnoen Klang, at the intersection of Thanon Dinso. The monument is roughly halfway between Sanam Luang, the former royal cremation ground in front of Wat Phra Kaew, and the temple of the Golden Mount (Phu Kao Thong).
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Golden Mount
Wat Saket Ratcha Wora Maha Wihan (usually short Wat Saket ) is a Buddhist temple in Pom Prap Sattru Phai district, Bangkok.
The temple dates back to Ayutthaya era, when it was called Wat Sakae. King Rama I renovated the temple and renamed it to Wat Saket. During the reign of King Rama III the Chedi Phu Khao Thong ( Golden mountain) was added to the temple. It was finished under King Rama V and then named Suwannabanphot . This building has become one of most popular the touristical places in Bangkok, however the other buildings of the temple are much less visited.
source: wikipedia