Unity in nepal - Jain Temple

I recently visited Nepal, being Jain we all search for Jain temples in our travel path. So did I.

I was amazed by the unity shown by the Jain's in Nepal at this visit to Jain Temple. The temple is both of "Svetambar" and "Digambar". This is the first temple which I know of which is symbol of unity in these two panths.
The temple was of two floors one for each panths.

1st Floor - Mahavir Swami Murti

TJYG Health

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Symbol of Jainism

Below is the Symbol of Jainism

Jain Symbol

 This Jain symbol was agreed upon by all Jain sects in 1974.

Why there are 24 Tirthankaras only?

The answer to this question can be perhaps available from the 87th stramza of "Yashstilakchulikc" scripture written by Acharya Somdev Suri. 

He observes:
There are indefinite number of Graha (Planet) – Nakshatra – Taras (Stars) (Heavenly elements in the sky). But their numbers has been shown to be limited by the rule of nature. In the present era of Utsarpini time-span, there are 24 times only when these heavenly elements are positioned in the best location. This is a certainty. 
Therefore there are only 24 Tirthankaras only not a one less not a one more.

Ancientness of Jainism

Jainism is considered to be an ancient religion with a history of many centuries. However the written record of ancient Indian people is very scares. Therefore, we have to depend more on secondary sources such as traditional lore, religious literature, archeological works and anthropological research.
Recent archeological research in Afghanistan, Pakistan and North - West India provide a much clearer picture of early Jain history. During this course of historical past, Jainism has gone through several changes and reforms and has also been divided into several sects.

The traditions and philosophy that Jains follow to-day or even those Mahavir followed in his own day, are very ancient. In fact, Jains claim that Jainism is an ETERNAL religious. The Kāl Chakrā (The Time Circle) devised by Jainism try to prove that Jainism is an eternal religion. There have been several innumerable such cycles throughout eternal time. Many western and eastern historians have attempted studying Jainism and they could realised that the Jainism has deep roots in history.