Stalinist-era buildings, mostly found in the central part of the city, are massive and usually ornamented with Socialist realism motifs that imitate classical themes. However, small churches—almost always Eastern Orthodox– found across the city provide glimpses of its past. The Old Arbat Street, a tourist street that was once the heart of a bohemian area, preserves most of its buildings from prior to the 20th century. Many buildings found off the main streets of the inner city (behind the Stalinist façades of Tverskaya Street, for example) are also examples of bourgeois architecture typical of Tsarist times. Ostankino Palace, Kuskovo, Uzkoye and other large estates just outside Moscow originally belong to nobles from the Tsarist era, and some convents, and monasteries, both inside and outside the city, are open to Muscovites and tourists.