The Sunsphere

The Sunsphere or sometimes known as the Wigsphere is the fourth and cheapest Aspirational Building available to purchase in The Simpsons: Tapped Out, following the Escalator To Nowhere, Popsicle Stick Skyscraper and the 50ft Magnifying Glass. It is the only aspirational building to be priced at under 1 million cash, and was released in August 2013 along with the Level 33 update.

The Sunsphere unlocks a quest involving Bart, Milhouse, Martin and Nelson. The player must be Level 5 in order to purchase it; however, the quest won't start until Level 21.

About
 is a large structure that serves as a symbol for the 1982 World's Fair in Knoxville, Tennessee.

Regular
Bart Martin Milhouse Nelson
 * Celebrate the ´WOD FIR´ - 16h
 * Celebrate the ´WOD FIR´ - 16h
 * Celebrate the ´WOD FIR´ - 16h
 * Celebrate the ´WOD FIR´ - 16h

Level Quest Based
Bart Martin Milhouse Nelson
 * Climb the Sunsphere - 12h
 * Climb the Sunsphere - 12h
 * Climb the Sunsphere - 12h
 * Climb the Sunsphere - 12h

Trivia

 * The Sunsphere was featured in The Simpsons episode "Bart on the Road" in which Bart, Milhouse, Nelson, and Martin head to Knoxville, Tennessee in the hopes of seeing the World's Fair, which occurred in 1982. In that episode, the Sunsphere became known as the "Wigsphere" where it was used to store thousands of boxes of unsold wigs. Nelson destroys both the Sunsphere and their vehicle by throwing a rock at it.
 * It is based on the real Sunsphere in Knoxville, Tennessee.
 * It is one of several locations, including O'Flanagan's Pub and the Volcano Lair, that were not located in Springfield in the series, but can be built in the player's town in the game.
 * It is animated. Several birds wearing wigs, an allusion to its use as a wig storage facility in the show, can be seen poking out through holes in the structure.
 * The Sunsphere is an aspirational building, but is one of two to have tasks associated with it, the Sit-N-Rotate is the other one.
 * It is the lowest priced aspirational building.
 * The quest name is an obvious parody to the Beatles' song Here Comes the Sun.