$spsite = Get-SPSite "https://adress"

$spsite.allwebs

$spsite.allwebs : Exception has been thrown by the target of an invocation
+ CategoryInfo          : NotSpecified: (:) [], TargetInvocationExcept
+ FullyQualifiedErrorId : System.Reflection.TargetInvocationException

PS C:Userssp_admin> $spsite.GetType()

IsPublic IsSerial Name                                     BaseType
-------- -------- ----                                     --------
True     False    SPSite                                   System.Object