##TL;DR:

#1. Ligeia and The Conqueror Worm

#2. A Predicament and How to Write a Blackwood Article

#3. Poems written as "Tamerlane"

#4. The Landscape-Garden, The Domain of Arnheim and Landor's Cottage

TL;DR:

1. Ligeia and The Conqueror Worm

2. A Predicament and How to Write a Blackwood Article

3. Poems written as "Tamerlane"

4. The Landscape-Garden, The Domain of Arnheim and Landor's Cottage

#1. Ligeia and The Conqueror Worm

##TL;DR:

There are a few connections between Poe's works, generally via one story being directly or indirectly referenced in another one published later. However, there are two instances of multiple stories having the same universe, and sometimes the same characters: A Predicament and How to Write a Blackwood Article, and The Landscape-Garden, The Domain of Arnheim and Landor's Cottage.

#1. Ligeia and The Conqueror Worm

#1. Ligeia and The Conqeuror Worm

#3. Poems written by "Tamerlane"

• To -- (also known as "Sleep on"_, published in 1833 in the Baltimore Saturday Visiter.
• Fanny, published in the same periodical a week later.

#4 The Landscape-Garden, The Domain of Arnheim and Landor's Cottage

#1. Ligeia and The Conqueror Worm

#3. Poems written as "Tamerlane"

• To -- (also known as "Sleep on"), published in 1833 in the Baltimore Saturday Visiter.
• Fanny, published in the same periodical a week later.

#4. The Landscape-Garden, The Domain of Arnheim and Landor's Cottage