I visited the Casa Curutchet in Argentina on the day after its inscription as WHS in 2016.

It's on the right side of the Rivadavia Park so it's quite easy to find. From outside you can already see some of the principle elements Le Corbusier used on his architecture design, including free facade and long windows.This might look normal to you but imagine this was built in 1953 where majority of the buildings were built on bricks (you can compare to the buildings both on the left and right). This really stands out as a modern architecture and many architects followed his concept of design. That's why it's inscribed as a World Heritage Site.

This place is considered cheap as a WHS compared to those in Argentina and quite easy to access. The building has three floors. I was totally amazed by the big tree in the middle of the house when I first walked in. I really love the concept putting nature as priority and keep it as it supposed to be. After walking passed the tree you can go to the so called backyard (the other part is occupied by architect college with no access). I like the first floor the most as they have a big space with a lot of information on the wall, and you can go out to the balcony to see the tree and the park. The second floor is more to office like with many cupboards. 

It's really worth a visit, especially it's less crowded compare to the La Plata Museum. When I visited it's still a new WHS so you can see the original things mostly, especially they still keep the leaning chair. Strongly recommended.