Some 2,200 museums, galleries and cultural institutions from over 64 countries are now taking part in the second annual #MuseumWeek on Twitter. The cyber celebration is designed to engage global audiences over seven themed days.

Monday's theme was #SecretsMW. The Met mysteriously tweeted about a statuette that was made for a 17th-century drinking game. The image was an elegant gilt 'Diana and the Stag.' The Frick showed a photo of a hidden bowling alley in its basement. And the National Gallery of Art posted a van Gogh, noting a "rustle of the olive grove has something very secret in it, and immensely old."

On Tuesday, follow the hastag #SouvenirsMW for gift shop goodies and other 'take-aways.'

Wednesday brings #architectureMW which Twitter describes as a way to "explore the history, architectural heritage, gardens and surroundings of museums."

Cultural muses are celebrated on Thursday's #inspirationMW. Friday's theme of #familyMW will give tips on visiting museums with kids. Saturday is time for #favMW to show off anyone's favorite artwork.

The week would not be complete without a selfie session. On Sunday, #poseMW is time to show your mug in front of a museum artwork. (But please leave your selfie stick at home, say some museums.)