Olesko Castle can be seen from the Kyiv - Chop highway not far from Lviv. It's located on a hill, so it's visible from everywhere.
First mentioned in 1327, the castle was rebuilt in 1975 and is one of the most famous castles in Ukraine. But, to be honest, it loses to most other famous picturesque castles. Although, if you have a helicopter, you can make wonderful photos, as those for the video about Ukraine (0:17).
There are several museums inside. The castle is surrounded by park, which was in very poor condition during our visit in 2008.
Getting there: By bus from the bus station #2 in Lviv (225 Bogdana Khmelnytskogo Street). The buses leave every 30 minutes.