Teleki-Bolyai Library

Museum in Târgu Mureş

Opened in 1802, this is one of the oldest libraries in Transylvania, named for its founder Count Sámuel Teleki de Szék. Technically still used as a public library, it’s now a 240,000-strong collection with treasures including 15th- to 19th-century encyclopedias and an engraved copy of the USA’s Declaration of Independence (1819). Visitors may need to knock to gain entry. No, you can’t touch the books.