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Photo: Coolcaesar, CC BY-SA 3.0 via Wikimedia Commons
National parliament, the first one in South America and an iconic symbol of Uruguay's long lasting democracy. The building was completed in 1925, inaugurated the same year to celebrate the centenary of the country's declaration of independence. It is a National Historic Landmark and quite impressive as it stands in the middle of a large square. It houses the legislature and the general assembly.
The Legislative Palace of Uruguay is a monumental building, meeting place of the General Assembly of Uruguay, and the seat of the legislative branch of the Uruguayan government. It is located in the Aguada neighborhood of Montevideo.
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Torre Antel
157 m high, this skyscraper is Uruguay's highest building. There's a viewing platform and even free guided tours (in Spanish).
Museo del Azulejo
Exhibiting over 5000 different colorful decorative tiles used in various buildings throughout the centuries. There are tiles from Uruguay and from other parts of Latin America and Europe. Also features special exhibitions of ceramics and paintings.
The padlock fountain
A small fountain at corner of Yi, completely covered by locks. Similar to bridges in many European cities, couples come here to attach a padlock to it. If they do so their love is supposed to last forever and they will also return to Montevideo someday.
MuHAr
Archeological museum with exhibits from Uruguay and other parts of the world, the exhibits include even Egyptian mummies.
Intendencia
The massive brick building is not just a city hall but also hosts the museums of photography and art history (MuHAr). There is a viewing platform in the tower that is open to the public.
Two museums in one building. The one showing the gaucho (South American cowboy) culture has everyday objects from drinking horns to weapons, as well as silverware, all from the 19th century, when the gauchos were riding around on the Pampas. The other museum, Museo de la Moneda, is a numismatic museum featuring bills, coins and medals from the last centuries. The museums are in Palacio Heber Jackson, a Cultural Heritage Monument and one of several iconic buildings along the avenue.