Amid Coronavirus Pandemic, Europe’s Myriad Cultural Sites Thrive Online 

The Louvre is closed tight, but visitors can still see its most popular masterpieces — including Leonardo da Vinci’s Mona Lisa — without being sandwiched between selfie-snapping tourists.     The Berlin Philharmonic is similarly shuttered, but classical music buffs can relive Beethoven’s Symphony No. 9, under chief conductor Kirill …