There is an unfinished building of the Museum of the East above the Carpenter's Tent.
You can start building after you have upgraded the Trader's Tent to level 4.
 
A quest to build the Museum of the East is called "A Modern Treasury".
It includes 8 stages with a time limit.
 
Stage 1 (24 hours)
Collect 22 сups of tea (Coffee House, Upgraded Coffee House)
Collect 3 strong ropes (Kindergarten)
Collect 59 mint leaves (Convenience Store, Upgraded Convenience Store) 
 
Stage 2 (24 hours)
Collect 4 protractors (Auto Repair Shop)
Collect 2 files with documents (City Hall)
Collect 35 pencils (Stationery Shop, Upgraded Stationery Shop) 
 
Stage 3 (24 hours)
Collect 3 sets of shells (Sushi Bar)
Collect 37 diamonds (Mansion)
Produce 12 lots of velvet (Textile Factory, Upgraded Textile Factory) 
 
Stage 4 (24 hours)
Collect 4 tool kits (Shopping Center)
Produce 28 lots of concrete compound (Construction Factory, Upgraded Construction Factory, Construction Megafactory)
Collect 7 shovels (in friends’ cities) 
 
Stage 5 (24 hours)
Produce 19 windows (Construction Factory, Upgraded Construction Factory, Megafactory)
Collect 23 trowels (Subway Station, Upgraded Subway Station)
Collect 19 paint rollers (Petrol Station, Upgraded Petrol Station) 
 
Stage 6 (24 hours)
Collect 3 jewelry sets (Jeweler’s Stall)
Collect 4 crystal balls (House with a Pond)
Collect 3 combs (Fashion Boutique, Upgraded Fashion Boutique) 
 
Stage 7 (24 hours)
Train 3 mechanics (College)
Ask friends for 9 repair kits 
Collect 16 sensors (Water Tower, Upgraded Water Tower) 
 
Stage 8 (24 hours)
Collect 4 paper lanterns (School, Valley School)
Collect 7 coloured bulbs (Summer Mansion)
Collect 49 green paints (Flower Kiosk, Upgraded Flower Kiosk, Flower Megamarket) 
 
After completing all 8 stages, the Museum of the East will bring you profits:
230 coins, random amount of energy every 6 hours.