Ancient Trees in Sofia
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The Mulberry of Vasil Levski
Mulberry (Morus alba). 220-650 years (disputed). Free, public street, viewable anytime

Ivan Vazov's Spruce
Norway Spruce (Picea abies). ~140 years. Free, public park, open daily

The Oak of Pencho Slaveykov
Pedunculate Oak (Quercus robur). 300-500+ years (disputed). Free, public park, open daily

The Gray Poplar of Doctors' Garden
Gray Poplar (Populus canescens). ~134 years. Free, public garden, open daily