The idea of constructing a dam across the river Krishna dates back to 1798.

The initial idea for the project dates back to 1996, with construction beginning in 1998.

The idea of planting such a garden dates back to 1925.

The idea for the piece dates back to 1968.

Actually, the idea of setting sculpture into a corner dates back to the beginning of the century.

The idea of building a mall on the former landfill, which closed in 1972, dates to 1995.

The idea for a bridge dates back to the 1930s, but most studies were done in the 1960s and 1970s.

The idea of the exhibition dates back 10 years, and it was actively planned for 5.

The idea dates back to the 1940s, but serious proposals were not made until the 1960s.

The idea for the center dates back to the late 1970s.