Hola Goo

Regardless of the subject being a person or a thing, there is always a singular and a plural, so for example if you are talking about "a museum" you use the verb in the singular form:

El museo es muy interesante.

The museum is very interesting.

If you are talking about more than one museum then you use the plural form:

Los museos son muy interesantes. 

The museums are very interesting.

You can also see the plural mark in the English: museum/museums

Having said that, you need to be careful with certain words (collective nouns) that are generally used as a plural noun in English but as a singular in Spanish. 

Here is a lesson for this if you'd like to have a look:

Some collective nouns

Saludos 

Inma