I believe you need to set eligibility criteria based on the topic/discipline. The most cited paper of all times might be something completely irrelevant to your area of interest, unless of course an all-time-high is part of your research.

Yes in the field of Engineering.

http://www.nature.com/news/the-top-100-papers-1.16224

Nature news. This link may be useful

You may check these in the field of computers & electrical engineering:

http://www.journals.elsevier.com/computers-and-electrical-engineering/most-cited-articles/

In IEEE database:

The most cited paper by research papers is: 

http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=1100705&sortType=desc_p_Citation_Count

The most cited paper by patents is:

http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6178212&sortType=desc_p_Patent_Count

The link below shows the most cited papers in IEEE journals and conferences papers in the field of Power Engineering 

https://scholar.google.com/citations?view_op=top_venues&hl=en&vq=eng_powerengineering

As an example, the link below shows the most cited papers in IEEE Transactions on Industrial Electronics

https://scholar.google.com/citations?hl=en&vq=eng&view_op=list_hcore&venue=CxA6KzCaQBgJ.2015

- The link below shows the most cited papers in IEEE Transactions on Power Electronics

https://scholar.google.com/citations?hl=en&vq=eng_powerengineering&view_op=list_hcore&venue=x_O7PX7uKNEJ.2015

....etc

I hope you will find these links are helpful.

Regards!