It was planned in the 1820s as a symbol of Scottish national pride and designed as a mini-Parthenon, in deference to the neoclassical style popular at the time.
It was designed in 1830 to symbolize Scottish heritage. 
mnli hypothesis: It was designed in 1830 to symbolize Scottish heritage.  premise: It was planned in the 1820s as a symbol of Scottish national pride and designed as a mini-Parthenon, in deference to the neoclassical style popular at the time.