How to detect my own MAC address from outside Internet (!) (NOT with ipconfig all)

How can I find out my own MAC address FROM outside the local network?

Yes, I know, I could simply type

ipconfig /all

to find all my local adapters MAC addresses out.

However I am using a couple of Virtual Machines, Firewalls, Security tools
and routers and I guess at least one of them is modifying my original MAC address.

Similarly to servces like

www.whatismyip.com

which shows my own IP like it is seen from other users I could imagine
that there are services which show my MAC address as it is visible from
outside Internet.

Is there such a web page which displays my MAC address ?

Ken