Another pair of twins I know of: the Brazilian and the Portuguese Cristo Redentor.
The Brazilian Cristo Redentor in Rio de Janeiro was built between 1922 and 1931. The idea, however, goes back to mid-19th century. The Christ’s statue is 30 meters tall, and standing on an 8 meter tall pedestal. His open arms symbolize peace. The statue is a work of Heitor da Silva Costa (Brazilian engineer responsible for the design) and the sculptor Paul Landowski.The location is breathtaking – at the top of 700 m tall Corcovado mountain, overlooking entire Rio.
I was lucky to visit it personally twice, in 2001 and this summer of 2013!
The Lisbon statue was built upon an idea of the Cardinal of Lisbon, after his visit to Rio de Janeiro in 1934. The construction was approved in 1940, and it has to do with Portuguese gratitude for being spared of the devastating effects of WWII. However, the construction lasted between 1949 and 1959, when the statue was inaugurated. The chapel, which is also a part of the monument, was only inaugurated 25 years later, in 1984.
The monument is situated in the municipality of Almada, at an elevated position at the left bank of Tagus. The 82 meters tall pedestal was designed by architect António Lino, while the 28 meter high statue made of concrete was the work of the sculptor named Francisco Franco de Sousa.