Some phrases and sentence about Taipei

-2004年之前，台北101大楼在世界上最高的建築。(Before 2004, Taipei 101 was the tallest building in the world.)
-台北101大樓有101层以及5层地下室。(Taipei 101 has 5 basement floors and 101 floors up.
-在新年的时候会烟花表演(they have new year fireworks)

-国立故宫博物馆National Palace Museum
-有693,507件中國古代文物和藝術品(It has 693,507 artifacts and art works)
-在紫禁城還是故宮。（What does this sentence mean？）

Lantern Festival
-直到元宵节，才会结束新年的庆祝活动。(This usually ends the Chinese new year celebration.)

And how would I say:
That's why I wanted to learn about it.这就是我想了解它的原因。

Some phrases and sentence about Taipei

-直到2004年，台北101是在世界上最高的建築。(Before 2004, Taipei 101 was the tallest building in the world.) 在2004年以前，台北101大楼是世界上最高的建筑。
-台北101大樓有5層地下和101層。(Taipei 101 has 5 basement floors and 101 floors up. 台北101大楼包括地下5层，地上101层。
-在新年有煙花表演(they have new year fireworks)

-National Palace Museum  国立故宫博物院
-有693,507件中國古代文物和藝術品(It has 693,507 artifacts and art works)
-在紫禁城還是故宮。

Lantern Festival
-這結束了中國 新年慶祝活動。(This usually ends the Chinese new year celebration.) 这通常代表中国新年庆祝活动的结束。 

And how would I say:
That's why I wanted to learn about it. 这就是为什么我想学习它。