The Declaration is actually kept in argon gas, not helium, with a little humidity to keep the document from becoming brittle. Argon gas is an inert gas and will not react chemically with any other chemicals in the ink or parchment of the document itself to harm it.
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The Declaration of Independence can be viewed at the National Archives Museum in Washington D.C
Philadlphia, Pennsylvania. =]
They are kept in the inert gas argon with a slight humidity to keep the documents flexible.
The story goes that it wasn't kept in a special place and when the 125th anniversary came they had to look for it. Found it in a box. Today it is in the National Archives in a case that is a safe.
One way in which the Texas Declaration of Independence and the U.S. Declaration of Independence mirror each other is that they both contain a set of grievances. Another similarity is that they both contain statements on the nature of government.