Narva

Narva needs 1 day: Narva Castle, from the 13th century, facing the Narva River with Russia's Ivangorod Fortress just 200 meters away on the opposite bank, the only European Union land border with Russia featuring two facing medieval fortresses. May-September is best. It's inexpensive. This pair of castles, one Estonian and one Russian, facing each other across the same river through centuries of shared and contentious history, is one of Europe's most singular border images. Check the current border situation before traveling.