Where does gothic come from ?

Gothic Literature, started by a man named Horrace Walpole. He is the first author to have ever written gothic literature with his novel The Castle of Ortranto.

 Horrace dreamed that he was in a dark castle and creepy castle, and standing on the uppermost banister of a long and winding staircase was a gigantic hand in full armor. This was the inspiration for the first ever gothic novel. The word "Gothic" was invented by writers of the Italian Renaissance who blamed the general “ugly” nature of 15th century art and architecture on people from the northern tribes of Germany barbarian tribes known collectively as “the Goths”.

The typical characteristics of a graphic novel are terror and mystery. Themes of death and decay especially that of the human body, are a big part of gothic literature as well. Ghosts, haunted houses, family curses, and insanity also play a part in gothic literature. They add a sense of suspense and fear. Edgar Allen Poe is considered the "master" of gothic literature with his stories such as "The Black Cat" and "A Tell Tale Heart". A more modern gothic author would be Stephen King. For example his short novel Christine and the movie The Shining are considered to be pure Goth. It just goes to show that gothic literature has not died and is still relevant in today's society. 

(Source: Eerie Books)

How gothic can be associated with romance!

Taking place in the Romantic era gothic romance came into affect.
The first person to come up with this idea was author Horace Walpole's "The Castle of Otranto." 
The setting of the book took place in a haunted castle which contains various and intensifying appearances of fear. The writings soon started to spread around the world to Eugene Sue from france to Edgar Allen Poe in the united states. 
During this movement during the romantic era many people rejected the enlightenment idea between balance and rationalism. 
Many of the readers anticipated the hysterical, mystical and horrified passionate adventures of the heros and heroines. 
The modern horror novels and women's romance novels both derived from Gothic Romance. 

http://www.wsu.edu/~brians/hum_303/romanticism.html

What comes along with the term of gothic ?

There are many gothic materials within the story of Frankenstein, the author of this book is Mary Shelley who uses vivid images and moods to describe the story piece by piece Shelley uses many elements such as rain and thunder during Victor's monster that he created. Another really gothic image is the way the monster was created (with other human limbs) these discriptive images really are dark and evil sounding. After the monster is created, Victor has terrible images of Elizabeth dying in his arms, and maggots start to come out of her body. I think the main gothic elements simplified are the emotions and overall feelings of gloom and despair throughout, the supernatural and the tragedy.

When we look at Shelley's piece of literature we see a lot of dark elements to this book, and these can be easily picked up throughout the book because of images that are easy to spot .